/*
 * Copyright (C) 2001-2003 FhG Fokus
 *
 * This file is part of Kamailio, a free SIP server.
 *
 * Kamailio is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version
 *
 * Kamailio is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 *
 *
 */
/** Via special params:
 * requests:
 * - if the address in via is different from the src_ip or an existing
 *   received=something is found, received=src_ip is added (and any preexisting
 *   received is deleted). received is added as the first via parameter if no
 *   receive is previously present or over the old receive.
 * - if the original via contains rport / rport=something or msg->msg_flags
 *   FL_FORCE_RPORT is set (e.g. script force_rport() cmd) rport=src_port
 *   is added (over previous rport / as first via param or after received
 *   if no received was present and received is added too)
 * local replies:
 *    (see also sl_send_reply)
 *  - rport and received are added in mostly the same way as for requests, but
 *    in the reverse order (first rport and then received). See also
 *    limitations.
 *  - if reply_to_via is set (default off) the local reply will be sent to
 *    the address in via (received is ignored since it was not set by us). The
 *    destination port is either the message source port if via contains rport
 *    or the FL_FORCE_RPORT flag is set or the port from the via. If either
 *    port or rport are present a normal dns lookup (instead of a srv lookup)
 *    is performed on the address. If no port is present and a srv lookup is
 *    performed the port is taken from the srv lookup. If the srv lookup failed
 *    or it was not performed, the port is set to the default sip port (5060).
 *  - if reply_to_via is off (default) the local reply is sent to the message
 *    source ip address. The destination port is set to the source port if
 *    rport is present or FL_FORCE_RPORT flag is set, to the via port or to
 *    the default sip port (5060) if neither rport or via port are present.
 * "normal" replies:
 *  - if received is present the message is sent to the received address else
 *    if no port is present (neither a normal via port or rport) a dns srv
 *    lookup is performed on the host part and the reply is sent to the
 *    resulting ip. If a port is present or the host part is an ip address
 *    the dns lookup will be a "normal" one (A or AAAA).
 *  - if rport is present, its value will be used as the destination port
 *   (and this will also disable srv lookups)
 *  - if no port is present the destination port will be taken from the srv
 *    lookup. If the srv lookup fails or is not performed (e.g. ip address
 *    in host) the destination port will be set to the default sip port (5060).
 *
 * Known limitations:
 * - when locally replying to a message, rport and received will be appended to
 *   the via header parameters (for forwarded requests they are inserted at the
 *   beginning).
 * - a locally generated reply might get two received via parameters if a
 *   received is already present in the original message (this should not
 *   happen though, but ...)
 *
 *--andrei
*/

/*!
 * \file
 * \brief Kamailio core :: Message translations
 * \ingroup core
 * Module: \ref core
 */

#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>

#include "comp_defs.h"
#include "msg_translator.h"
#include "globals.h"
#include "error.h"
#include "mem/mem.h"
#include "dprint.h"
#include "config.h"
#include "data_lump.h"
#include "data_lump_rpl.h"
#include "ip_addr.h"
#include "resolve.h"
#include "ut.h"
#include "pt.h"
#include "cfg/cfg.h"
#include "parser/parse_to.h"
#include "parser/parse_param.h"
#include "forward.h"
#include "str_list.h"
#include "pvapi.h"
#include "xavp.h"
#include "rand/kam_rand.h"

#define append_str_trans(_dest, _src, _len, _msg) \
	append_str((_dest), (_src), (_len));

extern char version[];
extern int version_len;

str _ksr_xavp_via_params = STR_NULL;
str _ksr_xavp_via_fields = STR_NULL;
str _ksr_xavp_via_reply_params = STR_NULL;
int ksr_local_rport = 0;

/** per process fixup function for global_req_flags.
  * It should be called from the configuration framework.
  */
void fix_global_req_flags(str *gname, str *name)
{
	global_req_flags = 0;
	switch(cfg_get(core, core_cfg, udp_mtu_try_proto)) {
		case PROTO_NONE:
		case PROTO_UDP:
			/* do nothing */
			break;
		case PROTO_TCP:
			global_req_flags |= FL_MTU_TCP_FB;
			break;
		case PROTO_TLS:
			global_req_flags |= FL_MTU_TLS_FB;
			break;
		case PROTO_SCTP:
			global_req_flags |= FL_MTU_SCTP_FB;
			break;
	}
	if(cfg_get(core, core_cfg, force_rport))
		global_req_flags |= FL_FORCE_RPORT;
}


/* checks if ip is in host(name) and ?host(ip)=name?
 * ip must be in network byte order!
 *  resolver = DO_DNS | DO_REV_DNS; if 0 no dns check is made
 * return 0 if equal */
static int check_via_address(
		struct ip_addr *ip, str *name, unsigned short port, int resolver)
{
	struct hostent *he;
	int i;
	char *s;
	int len;
	char lproto;

	/* maybe we are lucky and name it's an ip */
	s = ip_addr2a(ip);
	if(s) {
		LM_DBG("(%s, %.*s, %d)\n", s, name->len, name->s, resolver);

		len = strlen(s);

		/* check if name->s is an ipv6 address or an ipv6 address ref. */
		if((ip->af == AF_INET6)
				&& (((len == name->len)
							&& (strncasecmp(name->s, s, name->len) == 0))
						|| ((len == (name->len - 2)) && (name->s[0] == '[')
								&& (name->s[name->len - 1] == ']')
								&& (strncasecmp(name->s + 1, s, len) == 0)))) {
			return 0;
		} else {
			if(unlikely(name->s == NULL)) {
				LM_CRIT("invalid Via host name\n");
				return -1;
			}
			if(len == name->len && (strncmp(name->s, s, name->len) == 0))
				return 0;
		}
	} else {
		LM_CRIT("could not convert ip address\n");
		return -1;
	}

	if(port == 0)
		port = SIP_PORT;
	if(resolver & DO_DNS) {
		LM_DBG("doing dns lookup\n");
		/* try all names ips */
		lproto = PROTO_NONE;
		he = sip_resolvehost(name, &port, &lproto); /* don't use naptr */
		if(he && ip->af == he->h_addrtype) {
			for(i = 0; he && he->h_addr_list[i]; i++) {
				if(memcmp(&he->h_addr_list[i], ip->u.addr, ip->len) == 0)
					return 0;
			}
		}
	}
	if(resolver & DO_REV_DNS) {
		LM_DBG("doing rev. dns lookup\n");
		/* try reverse dns */
		he = rev_resolvehost(ip);
		if(he && (strncmp(he->h_name, name->s, name->len) == 0))
			return 0;
		for(i = 0; he && he->h_aliases[i]; i++) {
			if(strncmp(he->h_aliases[i], name->s, name->len) == 0)
				return 0;
		}
	}
	return -1;
}

/* check if rport has to be added or updated in Via
 * - return 1 on true; 0 on false */
int rport_test(struct sip_msg *msg)
{
	if(msg->msg_flags & FL_VIA_NORECEIVED) {
		return 0;
	}
	/* check if rport needs to be updated:
	 *  - if FL_FORCE_RPORT is set add it (and del. any previous version)
	 *  - if via already contains an rport add it and overwrite the previous
	 *  rport value if present (if you don't want to overwrite the previous
	 *  version remove the comments) */
	if(((msg->msg_flags | global_req_flags) & FL_FORCE_RPORT)
			|| (msg->via1->rport /*&& msg->via1->rport->value.s==0*/)) {
		return 1;
	}
	return 0;
}

/* check if IP address in Via != source IP address of signaling,
 * or the sender requires adding rport or received values */
int received_test(struct sip_msg *msg)
{
	int rcvd;

	if(msg->msg_flags & FL_VIA_NORECEIVED) {
		return 0;
	}
	rcvd = msg->via1->received || msg->via1->rport
		   || check_via_address(&msg->rcv.src_ip, &msg->via1->host,
				   msg->via1->port, received_dns);
	return rcvd;
}

/* check if IP address in Via != source IP address of signaling */
int received_via_test(struct sip_msg *msg)
{
	int rcvd;

	if(msg->msg_flags & FL_VIA_NORECEIVED) {
		return 0;
	}
	rcvd = (check_via_address(&msg->rcv.src_ip, &msg->via1->host,
					msg->via1->port, received_dns)
			!= 0);
	return rcvd;
}

static char *warning_builder(struct sip_msg *msg, unsigned int *returned_len)
{
	static char buf[MAX_WARNING_LEN];
	str *foo;
	int print_len, l;
	int clen;
	char *t;

#define str_print(string, string_len)    \
	do {                                 \
		l = (string_len);                \
		if((clen + l) > MAX_WARNING_LEN) \
			goto error_overflow;         \
		memcpy(buf + clen, (string), l); \
		clen += l;                       \
	} while(0)

#define str_lenpair_print(string, string_len, string2, string2_len) \
	do {                                                            \
		str_print(string, string_len);                              \
		str_print(string2, string2_len);                            \
	} while(0)

#define str_pair_print(string, string2, string2_len) \
	str_lenpair_print((string), strlen((string)), (string2), (string2_len))

#define str_int_print(string, intval)         \
	do {                                      \
		t = int2str((intval), &print_len);    \
		str_pair_print(string, t, print_len); \
	} while(0)

#define str_su_print(sockaddr)                 \
	do {                                       \
		t = su2a(&sockaddr, sizeof(sockaddr)); \
		print_len = strlen(t);                 \
		str_print(t, print_len);               \
	} while(0)

#define str_ipaddr_print(string, ipaddr_val)  \
	do {                                      \
		t = ip_addr2a((ipaddr_val));          \
		print_len = strlen(t);                \
		str_pair_print(string, t, print_len); \
	} while(0)

	clen = 0;
	str_print(WARNING, WARNING_LEN);
	str_su_print(msg->rcv.bind_address->su);
	str_print(WARNING_PHRASE, WARNING_PHRASE_LEN);

	/*adding out_uri*/
	if(msg->new_uri.s)
		foo = &(msg->new_uri);
	else
		foo = &(msg->first_line.u.request.uri);
	/* pid= */
	str_int_print(" pid=", my_pid());
	/* req_src_ip= */
	str_ipaddr_print(" req_src_ip=", &msg->rcv.src_ip);
	str_int_print(" req_src_port=", msg->rcv.src_port);
	str_pair_print(" in_uri=", msg->first_line.u.request.uri.s,
			msg->first_line.u.request.uri.len);
	str_pair_print(" out_uri=", foo->s, foo->len);
	str_pair_print(" via_cnt",
			(msg->parsed_flag & HDR_EOH_F) == HDR_EOH_F ? "=" : ">", 1);
	str_int_print("=", via_cnt);
	if(clen < MAX_WARNING_LEN) {
		buf[clen] = '"';
		clen++;
	} else
		goto error_overflow;


	*returned_len = clen;
	return buf;
error_overflow:
	LM_NOTICE("buffer size exceeded (probably too long URI)\n");
	*returned_len = 0;
	return 0;
}


char *received_builder(struct sip_msg *msg, unsigned int *received_len)
{
	char *buf;
	int len;
	struct ip_addr *source_ip;
	char *tmp;
	int tmp_len;

	source_ip = &msg->rcv.src_ip;

	buf = pkg_malloc(sizeof(char) * MAX_RECEIVED_SIZE);
	if(buf == 0) {
		ser_error = E_OUT_OF_MEM;
		PKG_MEM_ERROR;
		return 0;
	}
	memcpy(buf, RECEIVED, RECEIVED_LEN);
	if((tmp = ip_addr2a(source_ip)) == 0) {
		pkg_free(buf);
		return 0; /* error*/
	}
	tmp_len = strlen(tmp);
	len = RECEIVED_LEN + tmp_len;

	memcpy(buf + RECEIVED_LEN, tmp, tmp_len);
	buf[len] = 0; /*null terminate it */

	*received_len = len;
	return buf;
}


char *rport_builder(struct sip_msg *msg, unsigned int *rport_len)
{
	char *buf;
	char *tmp;
	int tmp_len;
	int len;

	tmp_len = 0;
	tmp = int2str(msg->rcv.src_port, &tmp_len);
	len = RPORT_LEN + tmp_len;
	buf = pkg_malloc(sizeof(char) * (len + 1)); /* space for null term */
	if(buf == 0) {
		ser_error = E_OUT_OF_MEM;
		PKG_MEM_ERROR;
		return 0;
	}
	memcpy(buf, RPORT, RPORT_LEN);
	memcpy(buf + RPORT_LEN, tmp, tmp_len);
	buf[len] = 0; /*null terminate it*/

	*rport_len = len;
	return buf;
}


char *id_builder(struct sip_msg *msg, unsigned int *id_len)
{
	char *buf;
	int len, value_len;
	char revhex[sizeof(int) * 2];
	char *p;
	int size;

	size = sizeof(int) * 2;
	p = &revhex[0];
	if(int2reverse_hex(&p, &size, msg->rcv.proto_reserved1) == -1) {
		LM_CRIT("not enough space for id\n");
		return 0;
	}
	value_len = p - &revhex[0];
	len = ID_PARAM_LEN + value_len;
	buf = pkg_malloc(sizeof(char) * (len + 1)); /* place for ending \0 */
	if(buf == 0) {
		ser_error = E_OUT_OF_MEM;
		PKG_MEM_ERROR;
		return 0;
	}
	memcpy(buf, ID_PARAM, ID_PARAM_LEN);
	memcpy(buf + ID_PARAM_LEN, revhex, value_len);
	buf[len] = 0; /* null terminate it */
	*id_len = len;
	return buf;
}


char *clen_builder(struct sip_msg *msg, int *clen_len, int diff, int body_only)
{
	char *buf;
	int len;
	int value;
	char *value_s;
	int value_len;
	char *body;


	body = get_body(msg);
	if(body == 0) {
		ser_error = E_BAD_REQ;
		LM_ERR("no message body found (missing crlf?) [[%.*s]]\n", msg->len,
				msg->buf);
		return 0;
	}
	value = msg->len - (int)(body - msg->buf) + diff;
	value_s = int2str(value, &value_len);
	LM_DBG("content-length: %d (%s)\n", value, value_s);

	if(body_only) {
		len = value_len;
	} else {
		len = CONTENT_LENGTH_LEN + value_len + CRLF_LEN;
	}
	buf = pkg_malloc(sizeof(char) * (len + 1));
	if(buf == 0) {
		ser_error = E_OUT_OF_MEM;
		PKG_MEM_ERROR;
		return 0;
	}
	if(body_only) {
		memcpy(buf, value_s, value_len);
	} else {
		memcpy(buf, CONTENT_LENGTH, CONTENT_LENGTH_LEN);
		memcpy(buf + CONTENT_LENGTH_LEN, value_s, value_len);
		memcpy(buf + CONTENT_LENGTH_LEN + value_len, CRLF, CRLF_LEN);
	}
	buf[len] = 0; /* null terminate it */
	*clen_len = len;
	return buf;
}


/* checks if a lump opt condition
 * returns 1 if cond is true, 0 if false */
static inline int lump_check_opt(
		struct lump *l, struct sip_msg *msg, struct dest_info *snd_i)
{
	struct ip_addr *ip;
	unsigned short port;
	int proto;

#define get_ip_port_proto                                 \
	if((snd_i == 0) || (snd_i->send_sock == 0)) {         \
		LM_CRIT("null send socket\n");                    \
		return 1; /* we presume they are different :-) */ \
	}                                                     \
	if(msg->rcv.bind_address) {                           \
		ip = &msg->rcv.bind_address->address;             \
		port = msg->rcv.bind_address->port_no;            \
		proto = msg->rcv.bind_address->proto;             \
	} else {                                              \
		ip = &msg->rcv.dst_ip;                            \
		port = msg->rcv.dst_port;                         \
		proto = msg->rcv.proto;                           \
	}

	switch(l->u.cond) {
		case COND_FALSE:
			return 0;
		case COND_TRUE:
			LUMP_SET_COND_TRUE(l);
			return 1;
		case COND_IF_DIFF_REALMS:
			get_ip_port_proto;
			/* faster tests first */
			if((port == snd_i->send_sock->port_no)
					&& (proto == snd_i->send_sock->proto)
					&& (msg->rcv.proto == snd_i->proto) &&
#ifdef USE_COMP
					(msg->rcv.comp == snd_i->comp) &&
#endif
					(ip_addr_cmp(ip, &snd_i->send_sock->address)))
				return 0;
			else {
				LUMP_SET_COND_TRUE(l);
				return 1;
			}
		case COND_IF_DIFF_AF:
			get_ip_port_proto;
			if(ip->af != snd_i->send_sock->address.af) {
				LUMP_SET_COND_TRUE(l);
				return 1;
			} else
				return 0;
		case COND_IF_DIFF_PROTO:
			get_ip_port_proto;
			if((proto != snd_i->send_sock->proto)
					|| (msg->rcv.proto != snd_i->proto)) {
				LUMP_SET_COND_TRUE(l);
				return 1;
			} else
				return 0;
		case COND_IF_DIFF_PORT:
			get_ip_port_proto;
			if(port != snd_i->send_sock->port_no) {
				LUMP_SET_COND_TRUE(l);
				return 1;
			} else
				return 0;
		case COND_IF_DIFF_IP:
			get_ip_port_proto;
			if(ip_addr_cmp(ip, &snd_i->send_sock->address))
				return 0;
			else {
				LUMP_SET_COND_TRUE(l);
				return 1;
			}
		case COND_IF_RAND:
			if(kam_rand() >= KAM_RAND_MAX / 2) {
				LUMP_SET_COND_TRUE(l);
				return 1;
			} else
				return 0;
		default:
			LM_CRIT("unknown lump condition %d\n", l->u.cond);
	}
	return 0; /* false */
}


/* computes the "unpacked" len of a lump list,
   code moved from build_req_from_req */
static inline int lumps_len(
		struct sip_msg *msg, struct lump *lumps, struct dest_info *send_info)
{
	int s_offset;
	int new_len;
	struct lump *t;
	struct lump *r;
	str *send_address_str = NULL;
	str *send_port_str = NULL;
	int send_proto_id = PROTO_NONE;
	int send_af = 0;
	str *recv_address_str = NULL;
	str *recv_port_str = NULL;
	int recv_port_no = 0;
	int recv_proto_id = PROTO_NONE;
	int recv_af = 0;
	struct socket_info *send_sock;


#ifdef USE_COMP
#define RCVCOMP_LUMP_LEN                                  \
	/* add;comp=xxx */                                    \
	switch(msg->rcv.comp) {                               \
		case COMP_NONE:                                   \
			break;                                        \
		case COMP_SIGCOMP:                                \
			new_len += COMP_PARAM_LEN + SIGCOMP_NAME_LEN; \
			break;                                        \
		case COMP_SERGZ:                                  \
			new_len += COMP_PARAM_LEN + SERGZ_NAME_LEN;   \
			break;                                        \
		default:                                          \
			LM_CRIT("unknown comp %d\n", msg->rcv.comp);  \
	}

#define SENDCOMP_LUMP_LEN                                  \
	/* add;comp=xxx */                                     \
	switch(send_info->comp) {                              \
		case COMP_NONE:                                    \
			break;                                         \
		case COMP_SIGCOMP:                                 \
			new_len += COMP_PARAM_LEN + SIGCOMP_NAME_LEN;  \
			break;                                         \
		case COMP_SERGZ:                                   \
			new_len += COMP_PARAM_LEN + SERGZ_NAME_LEN;    \
			break;                                         \
		default:                                           \
			LM_CRIT("unknown comp %d\n", send_info->comp); \
	}
#else
#define RCVCOMP_LUMP_LEN
#define SENDCOMP_LUMP_LEN
#endif /*USE_COMP */

#define SUBST_LUMP_LEN(subst_l)                                              \
	switch((subst_l)->u.subst) {                                             \
		case SUBST_RCV_IP:                                                   \
			if(msg->rcv.bind_address && STR_WITHVAL(recv_address_str)) {     \
				new_len += recv_address_str->len;                            \
				if(recv_af == AF_INET6)                                      \
					new_len += 2;                                            \
			} else {                                                         \
				LM_CRIT("rcv ip - null bind_address\n");                     \
			};                                                               \
			break;                                                           \
		case SUBST_RCV_PORT:                                                 \
			if(STR_WITHVAL(recv_port_str)) {                                 \
				new_len += recv_port_str->len;                               \
			} else {                                                         \
				LM_CRIT(" rcv port - null bind_address\n");                  \
			};                                                               \
			break;                                                           \
		case SUBST_RCV_PROTO:                                                \
			if(msg->rcv.bind_address) {                                      \
				switch(msg->rcv.bind_address->proto) {                       \
					case PROTO_NONE:                                         \
					case PROTO_UDP:                                          \
						new_len += 3;                                        \
						break;                                               \
					case PROTO_TCP:                                          \
					case PROTO_TLS:                                          \
						switch(msg->rcv.proto) {                             \
							case PROTO_WS:                                   \
							case PROTO_WSS:                                  \
								new_len += 2;                                \
								break;                                       \
							default:                                         \
								new_len += 3;                                \
								break;                                       \
						}                                                    \
						break;                                               \
					case PROTO_SCTP:                                         \
						new_len += 4;                                        \
						break;                                               \
					default:                                                 \
						LM_CRIT("unknown proto %d\n",                        \
								msg->rcv.bind_address->proto);               \
				}                                                            \
			} else {                                                         \
				LM_CRIT("null bind_address\n");                              \
			};                                                               \
			break;                                                           \
		case SUBST_RCV_ALL:                                                  \
		case SUBST_RCV_ALL_EX:                                               \
			if(msg->rcv.bind_address && STR_WITHVAL(recv_address_str)) {     \
				new_len += recv_address_str->len;                            \
				if((recv_af == AF_INET6) && (recv_address_str->s[0] != '[')  \
						&& (memchr(recv_address_str->s, ':',                 \
									recv_address_str->len)                   \
								!= NULL))                                    \
					new_len += 2;                                            \
				if(recv_port_no != SIP_PORT && STR_WITHVAL(recv_port_str)) { \
					/* add :port_no */                                       \
					new_len += 1 + recv_port_str->len;                       \
				}                                                            \
				/*add;transport=xxx*/                                        \
				switch(recv_proto_id) {                                      \
					case PROTO_NONE:                                         \
					case PROTO_UDP:                                          \
						break; /* udp is the default */                      \
					case PROTO_TCP:                                          \
					case PROTO_TLS:                                          \
						switch(msg->rcv.proto) {                             \
							case PROTO_WS:                                   \
							case PROTO_WSS:                                  \
								new_len += TRANSPORT_PARAM_LEN + 2;          \
								break;                                       \
							default:                                         \
								new_len += TRANSPORT_PARAM_LEN + 3;          \
								break;                                       \
						}                                                    \
						break;                                               \
					case PROTO_WS:                                           \
					case PROTO_WSS:                                          \
						new_len += TRANSPORT_PARAM_LEN + 2;                  \
						break;                                               \
					case PROTO_SCTP:                                         \
						new_len += TRANSPORT_PARAM_LEN + 4;                  \
						break;                                               \
					default:                                                 \
						LM_CRIT("unknown proto %d\n",                        \
								msg->rcv.bind_address->proto);               \
				}                                                            \
				if((subst_l)->u.subst == SUBST_RCV_ALL_EX                    \
						&& msg->rcv.bind_address->sockname.len > 0) {        \
					new_len += SOCKNAME_PARAM_LEN                            \
							   + msg->rcv.bind_address->sockname.len;        \
				}                                                            \
				RCVCOMP_LUMP_LEN                                             \
			} else {                                                         \
				LM_CRIT("null bind_address\n");                              \
			};                                                               \
			break;                                                           \
		case SUBST_SND_IP:                                                   \
			if(send_sock) {                                                  \
				new_len += send_address_str->len;                            \
				if(send_af == AF_INET6 && send_address_str->s[0] != '[')     \
					new_len += 2;                                            \
			} else {                                                         \
				LM_CRIT("null send_sock\n");                                 \
			};                                                               \
			break;                                                           \
		case SUBST_SND_PORT:                                                 \
			if(STR_WITHVAL(send_port_str)) {                                 \
				new_len += send_port_str->len;                               \
			} else {                                                         \
				LM_CRIT("null send sock port\n");                            \
			};                                                               \
			break;                                                           \
		case SUBST_SND_PROTO:                                                \
			if(send_sock) {                                                  \
				switch(send_sock->proto) {                                   \
					case PROTO_NONE:                                         \
					case PROTO_UDP:                                          \
						new_len += 3;                                        \
						break;                                               \
					case PROTO_TCP:                                          \
					case PROTO_TLS:                                          \
						switch(send_info->proto) {                           \
							case PROTO_WS:                                   \
							case PROTO_WSS:                                  \
								new_len += 2;                                \
								break;                                       \
							default:                                         \
								new_len += 3;                                \
								break;                                       \
						}                                                    \
						break;                                               \
					case PROTO_SCTP:                                         \
						new_len += 4;                                        \
						break;                                               \
					default:                                                 \
						LM_CRIT("unknown proto %d\n", send_sock->proto);     \
				}                                                            \
			} else {                                                         \
				LM_CRIT("null send_sock\n");                                 \
			};                                                               \
			break;                                                           \
		case SUBST_SND_ALL:                                                  \
		case SUBST_SND_ALL_EX:                                               \
			if(send_sock) {                                                  \
				new_len += send_address_str->len;                            \
				if((send_af == AF_INET6) && (send_address_str->s[0] != '[')  \
						&& (memchr(send_address_str->s, ':',                 \
									send_address_str->len)                   \
								!= NULL))                                    \
					new_len += 2;                                            \
				if(STR_WITHVAL(send_port_str)) {                             \
					/* add :port_no */                                       \
					new_len += 1 + send_port_str->len;                       \
				}                                                            \
				/*add;transport=xxx*/                                        \
				switch(send_proto_id) {                                      \
					case PROTO_NONE:                                         \
					case PROTO_UDP:                                          \
						break; /* udp is the default */                      \
					case PROTO_TCP:                                          \
					case PROTO_TLS:                                          \
						switch(send_info->proto) {                           \
							case PROTO_WS:                                   \
							case PROTO_WSS:                                  \
								new_len += TRANSPORT_PARAM_LEN + 2;          \
								break;                                       \
							default:                                         \
								new_len += TRANSPORT_PARAM_LEN + 3;          \
								break;                                       \
						}                                                    \
						break;                                               \
					case PROTO_WS:                                           \
					case PROTO_WSS:                                          \
						new_len += TRANSPORT_PARAM_LEN + 2;                  \
						break;                                               \
					case PROTO_SCTP:                                         \
						new_len += TRANSPORT_PARAM_LEN + 4;                  \
						break;                                               \
					default:                                                 \
						LM_CRIT("unknown proto %d\n", send_sock->proto);     \
				}                                                            \
				if((subst_l)->u.subst == SUBST_SND_ALL_EX                    \
						&& send_sock->sockname.len > 0) {                    \
					new_len += SOCKNAME_PARAM_LEN + send_sock->sockname.len; \
				}                                                            \
				SENDCOMP_LUMP_LEN                                            \
			} else {                                                         \
				LM_CRIT("null send_sock\n");                                 \
			};                                                               \
			break;                                                           \
		case SUBST_NOP: /* do nothing */                                     \
			break;                                                           \
		default:                                                             \
			LM_CRIT("unknown subst type %d\n", (subst_l)->u.subst);          \
	}

	if(send_info) {
		send_sock = send_info->send_sock;
	} else {
		send_sock = 0;
	};
	s_offset = 0;
	new_len = 0;
	/* init send_address_str & send_port_str */
	if(send_sock && send_sock->useinfo.name.len > 0) {
		send_address_str = &(send_sock->useinfo.name);
		send_af = send_sock->useinfo.af;
	} else if(msg->set_global_address.len) {
		send_address_str = &(msg->set_global_address);
		if(send_sock) {
			send_af = send_sock->address.af;
		}
	} else if(send_sock) {
		send_address_str = &(send_sock->address_str);
		send_af = send_sock->address.af;
	}
	if(send_sock && send_sock->useinfo.name.len > 0) {
		if(send_sock->useinfo.port_no > 0) {
			send_port_str = &(send_sock->useinfo.port_no_str);
		}
	} else if(msg->set_global_port.len) {
		send_port_str = &(msg->set_global_port);
	} else if(send_sock) {
		if(send_sock->port_no != SIP_PORT) {
			send_port_str = &(send_sock->port_no_str);
		}
	}
	if(send_sock) {
		if(send_sock->useinfo.proto != PROTO_NONE)
			send_proto_id = send_sock->useinfo.proto;
		else
			send_proto_id = send_sock->proto;
	}
	/* init recv_address_str, recv_port_str & recv_port_no */
	if(msg->rcv.bind_address) {
		if(msg->rcv.bind_address->useinfo.name.len > 0) {
			recv_address_str = &(msg->rcv.bind_address->useinfo.name);
			recv_af = msg->rcv.bind_address->useinfo.af;
		} else {
			recv_address_str = &(msg->rcv.bind_address->address_str);
			recv_af = msg->rcv.bind_address->address.af;
		}
		if(msg->rcv.bind_address->useinfo.name.len > 0) {
			if(msg->rcv.bind_address->useinfo.port_no > 0) {
				recv_port_str = &(msg->rcv.bind_address->useinfo.port_no_str);
				recv_port_no = msg->rcv.bind_address->useinfo.port_no;
			}
		} else {
			recv_port_str = &(msg->rcv.bind_address->port_no_str);
			recv_port_no = msg->rcv.bind_address->port_no;
		}
		if(msg->rcv.bind_address->useinfo.proto != PROTO_NONE) {
			recv_proto_id = msg->rcv.bind_address->useinfo.proto;
		} else {
			recv_proto_id = msg->rcv.bind_address->proto;
		}
	}

	for(t = lumps; t; t = t->next) {
		/* skip if this is an OPT lump and the condition is not satisfied */
		if((t->op == LUMP_ADD_OPT) && !lump_check_opt(t, msg, send_info))
			continue;
		for(r = t->before; r; r = r->before) {
			switch(r->op) {
				case LUMP_ADD:
					new_len += r->len;
					break;
				case LUMP_ADD_SUBST:
					SUBST_LUMP_LEN(r);
					break;
				case LUMP_ADD_OPT:
					/* skip if this is an OPT lump and the condition is
					 * not satisfied */
					if(!lump_check_opt(r, msg, send_info))
						goto skip_before;
					break;
				default:
					/* only ADD allowed for before/after */
					LM_CRIT("invalid op for data lump (%x)\n", r->op);
			}
		}
	skip_before:
		switch(t->op) {
			case LUMP_ADD:
				new_len += t->len;
				break;
			case LUMP_ADD_SUBST:
				SUBST_LUMP_LEN(t);
				break;
			case LUMP_ADD_OPT:
				/* we don't do anything here, it's only a condition for
				 * before & after */
				break;
			case LUMP_DEL:
				/* fix overlapping deleted zones */
				if(t->u.offset < s_offset) {
					/* change len */
					if(t->len > s_offset - t->u.offset)
						t->len -= s_offset - t->u.offset;
					else
						t->len = 0;
					t->u.offset = s_offset;
				}
				s_offset = t->u.offset + t->len;
				new_len -= t->len;
				break;
			case LUMP_NOP:
				/* fix offset if overlapping on a deleted zone */
				if(t->u.offset < s_offset) {
					t->u.offset = s_offset;
				} else
					s_offset = t->u.offset;
				/* do nothing */
				break;
			default:
				LM_CRIT("invalid op for data lump (%x)\n", r->op);
		}
		for(r = t->after; r; r = r->after) {
			switch(r->op) {
				case LUMP_ADD:
					new_len += r->len;
					break;
				case LUMP_ADD_SUBST:
					SUBST_LUMP_LEN(r);
					break;
				case LUMP_ADD_OPT:
					/* skip if this is an OPT lump and the condition is
					 * not satisfied */
					if(!lump_check_opt(r, msg, send_info))
						goto skip_after;
					break;
				default:
					/* only ADD allowed for before/after */
					LM_CRIT("invalid op for data lump (%x)\n", r->op);
			}
		}
	skip_after:; /* to make gcc 3.* happy */
	}
	return new_len;
#undef RCVCOMP_LUMP_LEN
#undef SENDCOMP_LUMP_LEN
}


/* another helper functions, adds/Removes the lump,
	code moved form build_req_from_req  */

void process_lumps(struct sip_msg *msg, struct lump *lumps, char *new_buf,
		unsigned int *new_buf_offs, unsigned int *orig_offs,
		struct dest_info *send_info, int flag)
{
	struct lump *t;
	struct lump *r;
	char *orig;
	int size;
	int offset;
	int s_offset;
	str *send_address_str = NULL;
	str *send_port_str = NULL;
	int send_proto_id = PROTO_NONE;
	int send_af = 0;
	str *recv_address_str = NULL;
	str *recv_port_str = NULL;
	int recv_port_no = 0;
	int recv_proto_id = PROTO_NONE;
	int recv_af = 0;
	struct socket_info *send_sock;

#ifdef USE_COMP
#define RCVCOMP_PARAM_ADD                                             \
	/* add ;comp=xxxx */                                              \
	switch(msg->rcv.comp) {                                           \
		case COMP_NONE:                                               \
			break;                                                    \
		case COMP_SIGCOMP:                                            \
			memcpy(new_buf + offset, COMP_PARAM, COMP_PARAM_LEN);     \
			offset += COMP_PARAM_LEN;                                 \
			memcpy(new_buf + offset, SIGCOMP_NAME, SIGCOMP_NAME_LEN); \
			offset += SIGCOMP_NAME_LEN;                               \
			break;                                                    \
		case COMP_SERGZ:                                              \
			memcpy(new_buf + offset, COMP_PARAM, COMP_PARAM_LEN);     \
			offset += COMP_PARAM_LEN;                                 \
			memcpy(new_buf + offset, SERGZ_NAME, SERGZ_NAME_LEN);     \
			offset += SERGZ_NAME_LEN;                                 \
			break;                                                    \
		default:                                                      \
			LM_CRIT("unknown comp %d\n", msg->rcv.comp);              \
	}

#define SENDCOMP_PARAM_ADD                                            \
	/* add ;comp=xxxx */                                              \
	switch(send_info->comp) {                                         \
		case COMP_NONE:                                               \
			break;                                                    \
		case COMP_SIGCOMP:                                            \
			memcpy(new_buf + offset, COMP_PARAM, COMP_PARAM_LEN);     \
			offset += COMP_PARAM_LEN;                                 \
			memcpy(new_buf + offset, SIGCOMP_NAME, SIGCOMP_NAME_LEN); \
			offset += SIGCOMP_NAME_LEN;                               \
			break;                                                    \
		case COMP_SERGZ:                                              \
			memcpy(new_buf + offset, COMP_PARAM, COMP_PARAM_LEN);     \
			offset += COMP_PARAM_LEN;                                 \
			memcpy(new_buf + offset, SERGZ_NAME, SERGZ_NAME_LEN);     \
			offset += SERGZ_NAME_LEN;                                 \
			break;                                                    \
		default:                                                      \
			LM_CRIT("unknown comp %d\n", msg->rcv.comp);              \
	}
#else
#define RCVCOMP_PARAM_ADD
#define SENDCOMP_PARAM_ADD
#endif /* USE_COMP */

#define SUBST_LUMP(subst_l)                                                    \
	switch((subst_l)->u.subst) {                                               \
		case SUBST_RCV_IP:                                                     \
			if(msg->rcv.bind_address && STR_WITHVAL(recv_address_str)) {       \
				if(recv_af == AF_INET6) {                                      \
					new_buf[offset] = '[';                                     \
					offset++;                                                  \
				}                                                              \
				memcpy(new_buf + offset, recv_address_str->s,                  \
						recv_address_str->len);                                \
				offset += recv_address_str->len;                               \
				if(recv_af == AF_INET6) {                                      \
					new_buf[offset] = ']';                                     \
					offset++;                                                  \
				}                                                              \
			} else {                                                           \
				LM_CRIT("null bind_address\n");                                \
			};                                                                 \
			break;                                                             \
		case SUBST_RCV_PORT:                                                   \
			if(STR_WITHVAL(recv_port_str)) {                                   \
				memcpy(new_buf + offset, recv_port_str->s,                     \
						recv_port_str->len);                                   \
				offset += recv_port_str->len;                                  \
			} else {                                                           \
				LM_CRIT("null bind_address\n");                                \
			};                                                                 \
			break;                                                             \
		case SUBST_RCV_ALL:                                                    \
		case SUBST_RCV_ALL_EX:                                                 \
			if(msg->rcv.bind_address && STR_WITHVAL(recv_address_str)) {       \
				/* address */                                                  \
				if((recv_af == AF_INET6) && (recv_address_str->s[0] != '[')    \
						&& (memchr(recv_address_str->s, ':',                   \
									recv_address_str->len)                     \
								!= NULL)) {                                    \
					new_buf[offset] = '[';                                     \
					offset++;                                                  \
				}                                                              \
				memcpy(new_buf + offset, recv_address_str->s,                  \
						recv_address_str->len);                                \
				offset += recv_address_str->len;                               \
				if((recv_af == AF_INET6) && (recv_address_str->s[0] != '[')    \
						&& (memchr(recv_address_str->s, ':',                   \
									recv_address_str->len)                     \
								!= NULL)) {                                    \
					new_buf[offset] = ']';                                     \
					offset++;                                                  \
				}                                                              \
				/* :port */                                                    \
				if(recv_port_no != SIP_PORT && STR_WITHVAL(recv_port_str)) {   \
					new_buf[offset] = ':';                                     \
					offset++;                                                  \
					memcpy(new_buf + offset, recv_port_str->s,                 \
							recv_port_str->len);                               \
					offset += recv_port_str->len;                              \
				}                                                              \
				switch(recv_proto_id) {                                        \
					case PROTO_NONE:                                           \
					case PROTO_UDP:                                            \
						break; /* nothing to do, udp is default*/              \
					case PROTO_TCP:                                            \
						memcpy(new_buf + offset, TRANSPORT_PARAM,              \
								TRANSPORT_PARAM_LEN);                          \
						offset += TRANSPORT_PARAM_LEN;                         \
						if(msg->rcv.proto == PROTO_WS) {                       \
							memcpy(new_buf + offset, "ws", 2);                 \
							offset += 2;                                       \
						} else {                                               \
							memcpy(new_buf + offset, "tcp", 3);                \
							offset += 3;                                       \
						}                                                      \
						break;                                                 \
					case PROTO_TLS:                                            \
						memcpy(new_buf + offset, TRANSPORT_PARAM,              \
								TRANSPORT_PARAM_LEN);                          \
						offset += TRANSPORT_PARAM_LEN;                         \
						if(msg->rcv.proto == PROTO_WS                          \
								|| msg->rcv.proto == PROTO_WSS) {              \
							memcpy(new_buf + offset, "ws", 2);                 \
							offset += 2;                                       \
						} else {                                               \
							memcpy(new_buf + offset, "tls", 3);                \
							offset += 3;                                       \
						}                                                      \
						break;                                                 \
					case PROTO_WS:                                             \
					case PROTO_WSS:                                            \
						memcpy(new_buf + offset, TRANSPORT_PARAM,              \
								TRANSPORT_PARAM_LEN);                          \
						offset += TRANSPORT_PARAM_LEN;                         \
						memcpy(new_buf + offset, "ws", 2);                     \
						offset += 2;                                           \
						break;                                                 \
					case PROTO_SCTP:                                           \
						memcpy(new_buf + offset, TRANSPORT_PARAM,              \
								TRANSPORT_PARAM_LEN);                          \
						offset += TRANSPORT_PARAM_LEN;                         \
						memcpy(new_buf + offset, "sctp", 4);                   \
						offset += 4;                                           \
						break;                                                 \
					default:                                                   \
						LM_CRIT("unknown proto %d\n",                          \
								msg->rcv.bind_address->proto);                 \
				}                                                              \
				if((subst_l)->u.subst == SUBST_RCV_ALL_EX                      \
						&& msg->rcv.bind_address->sockname.len > 0) {          \
					memcpy(new_buf + offset, SOCKNAME_PARAM,                   \
							SOCKNAME_PARAM_LEN);                               \
					offset += SOCKNAME_PARAM_LEN;                              \
					memcpy(new_buf + offset,                                   \
							msg->rcv.bind_address->sockname.s,                 \
							msg->rcv.bind_address->sockname.len);              \
					offset += msg->rcv.bind_address->sockname.len;             \
				}                                                              \
				RCVCOMP_PARAM_ADD                                              \
			} else {                                                           \
				LM_CRIT("null bind_address\n");                                \
			};                                                                 \
			break;                                                             \
		case SUBST_SND_IP:                                                     \
			if(send_sock) {                                                    \
				if((send_af == AF_INET6) && (send_address_str->s[0] != '[')) { \
					new_buf[offset] = '[';                                     \
					offset++;                                                  \
				}                                                              \
				memcpy(new_buf + offset, send_address_str->s,                  \
						send_address_str->len);                                \
				offset += send_address_str->len;                               \
				if((send_af == AF_INET6) && (send_address_str->s[0] != '[')) { \
					new_buf[offset] = ']';                                     \
					offset++;                                                  \
				}                                                              \
			} else {                                                           \
				LM_CRIT("null send_sock\n");                                   \
			};                                                                 \
			break;                                                             \
		case SUBST_SND_PORT:                                                   \
			if(STR_WITHVAL(send_port_str)) {                                   \
				memcpy(new_buf + offset, send_port_str->s,                     \
						send_port_str->len);                                   \
				offset += send_port_str->len;                                  \
			} else {                                                           \
				LM_CRIT("null send sock port\n");                              \
			};                                                                 \
			break;                                                             \
		case SUBST_SND_ALL:                                                    \
		case SUBST_SND_ALL_EX:                                                 \
			if(send_sock) {                                                    \
				/* address */                                                  \
				if((send_af == AF_INET6) && (send_address_str->s[0] != '[')    \
						&& (memchr(send_address_str->s, ':',                   \
									send_address_str->len)                     \
								!= NULL)) {                                    \
					new_buf[offset] = '[';                                     \
					offset++;                                                  \
				}                                                              \
				memcpy(new_buf + offset, send_address_str->s,                  \
						send_address_str->len);                                \
				offset += send_address_str->len;                               \
				if((send_af == AF_INET6) && (send_address_str->s[0] != '[')    \
						&& (memchr(send_address_str->s, ':',                   \
									send_address_str->len)                     \
								!= NULL)) {                                    \
					new_buf[offset] = ']';                                     \
					offset++;                                                  \
				}                                                              \
				/* :port */                                                    \
				if(STR_WITHVAL(send_port_str)) {                               \
					new_buf[offset] = ':';                                     \
					offset++;                                                  \
					memcpy(new_buf + offset, send_port_str->s,                 \
							send_port_str->len);                               \
					offset += send_port_str->len;                              \
				}                                                              \
				switch(send_proto_id) {                                        \
					case PROTO_NONE:                                           \
					case PROTO_UDP:                                            \
						break; /* nothing to do, udp is default*/              \
					case PROTO_TCP:                                            \
						memcpy(new_buf + offset, TRANSPORT_PARAM,              \
								TRANSPORT_PARAM_LEN);                          \
						offset += TRANSPORT_PARAM_LEN;                         \
						if(send_info->proto == PROTO_WS) {                     \
							memcpy(new_buf + offset, "ws", 2);                 \
							offset += 2;                                       \
						} else {                                               \
							memcpy(new_buf + offset, "tcp", 3);                \
							offset += 3;                                       \
						}                                                      \
						break;                                                 \
					case PROTO_TLS:                                            \
						memcpy(new_buf + offset, TRANSPORT_PARAM,              \
								TRANSPORT_PARAM_LEN);                          \
						offset += TRANSPORT_PARAM_LEN;                         \
						if(send_info->proto == PROTO_WS                        \
								|| send_info->proto == PROTO_WSS) {            \
							memcpy(new_buf + offset, "ws", 2);                 \
							offset += 2;                                       \
						} else {                                               \
							memcpy(new_buf + offset, "tls", 3);                \
							offset += 3;                                       \
						}                                                      \
						break;                                                 \
					case PROTO_WS:                                             \
					case PROTO_WSS:                                            \
						memcpy(new_buf + offset, TRANSPORT_PARAM,              \
								TRANSPORT_PARAM_LEN);                          \
						offset += TRANSPORT_PARAM_LEN;                         \
						memcpy(new_buf + offset, "ws", 2);                     \
						offset += 2;                                           \
						break;                                                 \
					case PROTO_SCTP:                                           \
						memcpy(new_buf + offset, TRANSPORT_PARAM,              \
								TRANSPORT_PARAM_LEN);                          \
						offset += TRANSPORT_PARAM_LEN;                         \
						memcpy(new_buf + offset, "sctp", 4);                   \
						offset += 4;                                           \
						break;                                                 \
					default:                                                   \
						LM_CRIT("unknown proto %d\n", send_sock->proto);       \
				}                                                              \
				if((subst_l)->u.subst == SUBST_SND_ALL_EX                      \
						&& send_sock->sockname.len > 0) {                      \
					memcpy(new_buf + offset, SOCKNAME_PARAM,                   \
							SOCKNAME_PARAM_LEN);                               \
					offset += SOCKNAME_PARAM_LEN;                              \
					memcpy(new_buf + offset, send_sock->sockname.s,            \
							send_sock->sockname.len);                          \
					offset += send_sock->sockname.len;                         \
				}                                                              \
				SENDCOMP_PARAM_ADD                                             \
			} else {                                                           \
				LM_CRIT("null bind_address\n");                                \
			};                                                                 \
			break;                                                             \
		case SUBST_RCV_PROTO:                                                  \
			if(msg->rcv.bind_address) {                                        \
				switch(msg->rcv.bind_address->proto) {                         \
					case PROTO_NONE:                                           \
					case PROTO_UDP:                                            \
						memcpy(new_buf + offset, "udp", 3);                    \
						offset += 3;                                           \
						break;                                                 \
					case PROTO_TCP:                                            \
						if(msg->rcv.proto == PROTO_WS) {                       \
							memcpy(new_buf + offset, "ws", 2);                 \
							offset += 2;                                       \
						} else {                                               \
							memcpy(new_buf + offset, "tcp", 3);                \
							offset += 3;                                       \
						}                                                      \
						break;                                                 \
					case PROTO_TLS:                                            \
						if(msg->rcv.proto == PROTO_WS                          \
								|| msg->rcv.proto == PROTO_WSS) {              \
							memcpy(new_buf + offset, "ws", 2);                 \
							offset += 2;                                       \
						} else {                                               \
							memcpy(new_buf + offset, "tls", 3);                \
							offset += 3;                                       \
						}                                                      \
						break;                                                 \
					case PROTO_SCTP:                                           \
						memcpy(new_buf + offset, "sctp", 4);                   \
						offset += 4;                                           \
						break;                                                 \
					default:                                                   \
						LM_CRIT("unknown proto %d\n",                          \
								msg->rcv.bind_address->proto);                 \
				}                                                              \
			} else {                                                           \
				LM_CRIT("null send_sock\n");                                   \
			};                                                                 \
			break;                                                             \
		case SUBST_SND_PROTO:                                                  \
			if(send_sock) {                                                    \
				switch(send_sock->proto) {                                     \
					case PROTO_NONE:                                           \
					case PROTO_UDP:                                            \
						memcpy(new_buf + offset, "udp", 3);                    \
						offset += 3;                                           \
						break;                                                 \
					case PROTO_TCP:                                            \
						if(send_info->proto == PROTO_WS) {                     \
							memcpy(new_buf + offset, "ws", 2);                 \
							offset += 2;                                       \
						} else {                                               \
							memcpy(new_buf + offset, "tcp", 3);                \
							offset += 3;                                       \
						}                                                      \
						break;                                                 \
					case PROTO_TLS:                                            \
						if(send_info->proto == PROTO_WS                        \
								|| send_info->proto == PROTO_WSS) {            \
							memcpy(new_buf + offset, "ws", 2);                 \
							offset += 2;                                       \
						} else {                                               \
							memcpy(new_buf + offset, "tls", 3);                \
							offset += 3;                                       \
						}                                                      \
						break;                                                 \
					case PROTO_SCTP:                                           \
						memcpy(new_buf + offset, "sctp", 4);                   \
						offset += 4;                                           \
						break;                                                 \
					default:                                                   \
						LM_CRIT("unknown proto %d\n", send_sock->proto);       \
				}                                                              \
			} else {                                                           \
				LM_CRIT("null send_sock\n");                                   \
			};                                                                 \
			break;                                                             \
		default:                                                               \
			LM_CRIT("unknown subst type %d\n", (subst_l)->u.subst);            \
	}

	if(send_info) {
		send_sock = send_info->send_sock;
	} else {
		send_sock = 0;
	}
	/* init send_address_str & send_port_str */
	if(send_sock && send_sock->useinfo.name.len > 0) {
		send_address_str = &(send_sock->useinfo.name);
		send_af = send_sock->useinfo.af;
	} else if(msg->set_global_address.len) {
		send_address_str = &(msg->set_global_address);
		if(send_sock) {
			send_af = send_sock->address.af;
		}
	} else if(send_sock) {
		send_address_str = &(send_sock->address_str);
		send_af = send_sock->address.af;
	}
	if(send_sock && send_sock->useinfo.name.len > 0) {
		if(send_sock->useinfo.port_no > 0) {
			send_port_str = &(send_sock->useinfo.port_no_str);
		}
	} else if(msg->set_global_port.len) {
		send_port_str = &(msg->set_global_port);
	} else if(send_sock) {
		if(send_sock->port_no != SIP_PORT) {
			send_port_str = &(send_sock->port_no_str);
		}
	}
	if(send_sock) {
		if(send_sock->useinfo.proto != PROTO_NONE)
			send_proto_id = send_sock->useinfo.proto;
		else
			send_proto_id = send_sock->proto;
	}
	/* init recv_address_str, recv_port_str & recv_port_no */
	if(msg->rcv.bind_address) {
		if(msg->rcv.bind_address->useinfo.name.len > 0) {
			recv_address_str = &(msg->rcv.bind_address->useinfo.name);
			recv_af = msg->rcv.bind_address->useinfo.af;
		} else {
			recv_address_str = &(msg->rcv.bind_address->address_str);
			recv_af = msg->rcv.bind_address->address.af;
		}
		if(msg->rcv.bind_address->useinfo.name.len > 0) {
			if(msg->rcv.bind_address->useinfo.port_no > 0) {
				recv_port_str = &(msg->rcv.bind_address->useinfo.port_no_str);
				recv_port_no = msg->rcv.bind_address->useinfo.port_no;
			}
		} else {
			recv_port_str = &(msg->rcv.bind_address->port_no_str);
			recv_port_no = msg->rcv.bind_address->port_no;
		}
		if(msg->rcv.bind_address->useinfo.proto != PROTO_NONE) {
			recv_proto_id = msg->rcv.bind_address->useinfo.proto;
		} else {
			recv_proto_id = msg->rcv.bind_address->proto;
		}
	}

	orig = msg->buf;
	offset = *new_buf_offs;
	s_offset = *orig_offs;

	for(t = lumps; t; t = t->next) {
		switch(t->op) {
			case LUMP_ADD:
			case LUMP_ADD_SUBST:
			case LUMP_ADD_OPT:
				/* skip if this is an OPT lump and the condition is
				 * not satisfied */
				if((t->op == LUMP_ADD_OPT)
						&& (!lump_check_opt(t, msg, send_info)))
					continue;
				/* just add it here! */
				/* process before  */
				for(r = t->before; r; r = r->before) {
					switch(r->op) {
						case LUMP_ADD:
							/*just add it here*/
							memcpy(new_buf + offset, r->u.value, r->len);
							offset += r->len;
							break;
						case LUMP_ADD_SUBST:
							SUBST_LUMP(r);
							break;
						case LUMP_ADD_OPT:
							/* skip if this is an OPT lump and the condition is
					 		* not satisfied */
							if(!lump_check_opt(r, msg, send_info))
								goto skip_before;
							break;
						default:
							/* only ADD allowed for before/after */
							LM_CRIT("invalid op for data lump (%x)\n", r->op);
					}
				}
			skip_before:
				/* copy "main" part */
				switch(t->op) {
					case LUMP_ADD:
						memcpy(new_buf + offset, t->u.value, t->len);
						offset += t->len;
						break;
					case LUMP_ADD_SUBST:
						SUBST_LUMP(t);
						break;
					case LUMP_ADD_OPT:
						/* do nothing, it's only a condition */
						break;
					default:
						/* should not ever get here */
						LM_CRIT("unhandled data lump op %d\n", t->op);
				}
				/* process after */
				for(r = t->after; r; r = r->after) {
					switch(r->op) {
						case LUMP_ADD:
							/*just add it here*/
							memcpy(new_buf + offset, r->u.value, r->len);
							offset += r->len;
							break;
						case LUMP_ADD_SUBST:
							SUBST_LUMP(r);
							break;
						case LUMP_ADD_OPT:
							/* skip if this is an OPT lump and the condition is
					 		* not satisfied */
							if(!lump_check_opt(r, msg, send_info))
								goto skip_after;
							break;
						default:
							/* only ADD allowed for before/after */
							LM_CRIT("invalid op for data lump (%x)\n", r->op);
					}
				}
			skip_after:
				break;
			case LUMP_NOP:
			case LUMP_DEL:
				/* copy till offset */
				if(s_offset > t->u.offset) {
					LM_DBG("WARNING: (%d) overlapped lumps offsets,"
						   " ignoring(%x, %x)\n",
							t->op, s_offset, t->u.offset);
					/* this should've been fixed above (when computing len) */
					/* just ignore it*/
					break;
				}
				size = t->u.offset - s_offset;
				if(size > 0 && flag == FLAG_MSG_ALL) {
					memcpy(new_buf + offset, orig + s_offset, size);
					offset += size;
					s_offset += size;
				} else if(flag == FLAG_MSG_LUMPS_ONLY) {
					/* do not copy the whole message, jump to the lumps offs */
					s_offset += size;
				}

				/* the LUMP_DELs are printed with "- " before them */
				if(t->op == LUMP_DEL && flag == FLAG_MSG_LUMPS_ONLY) {
					new_buf[offset++] = '-';
					new_buf[offset++] = ' ';
				}

				/* process before  */
				for(r = t->before; r; r = r->before) {
					switch(r->op) {
						case LUMP_ADD:
							/*just add it here*/
							memcpy(new_buf + offset, r->u.value, r->len);
							offset += r->len;
							break;
						case LUMP_ADD_SUBST:
							SUBST_LUMP(r);
							break;
						case LUMP_ADD_OPT:
							/* skip if this is an OPT lump and the condition is
					 		* not satisfied */
							if(!lump_check_opt(r, msg, send_info))
								goto skip_nop_before;
							break;
						default:
							/* only ADD allowed for before/after */
							LM_CRIT("invalid op for data lump (%x)\n", r->op);
					}
				}
			skip_nop_before:
				/* process main (del only) */
				if(t->op == LUMP_DEL && flag == FLAG_MSG_ALL) {
					/* skip len bytes from orig msg */
					s_offset += t->len;
				} else if(t->op == LUMP_DEL && flag == FLAG_MSG_LUMPS_ONLY) {
					/* copy lump value and indent as necessarily */
					memcpy(new_buf + offset, orig + t->u.offset, t->len);
					offset += t->len;
					if(new_buf[offset - 1] != '\n') {
						new_buf[offset] = '\n';
						offset += 1;
					}
					/* skip len bytes from orig msg */
					s_offset += t->len;
				}

				/* process after */
				for(r = t->after; r; r = r->after) {
					switch(r->op) {
						case LUMP_ADD:
							/*just add it here*/
							memcpy(new_buf + offset, r->u.value, r->len);
							offset += r->len;
							break;
						case LUMP_ADD_SUBST:
							SUBST_LUMP(r);
							break;
						case LUMP_ADD_OPT:
							/* skip if this is an OPT lump and the condition is
					 		* not satisfied */
							if(!lump_check_opt(r, msg, send_info))
								goto skip_nop_after;
							break;
						default:
							/* only ADD allowed for before/after */
							LM_CRIT("invalid op for data lump (%x)\n", r->op);
					}
				}
			skip_nop_after:
				break;
			default:
				LM_CRIT("unknown op (%x)\n", t->op);
		}
	}
	*new_buf_offs = offset;
	*orig_offs = s_offset;

	/* add '\0' to char* lump list to print it smoothly */
	if(flag == FLAG_MSG_LUMPS_ONLY) {
		new_buf[offset] = '\0';
	}
#undef RCVCOMP_PARAM_ADD
#undef SENDCOMP_PARAM_ADD
}


/*
 * Adjust/insert Content-Length if necessary
 */
static inline int adjust_clen(struct sip_msg *msg, int body_delta, int proto)
{
	struct lump *anchor;
	char *clen_buf;
	int clen_len, body_only;
#ifdef USE_TCP
	char *body;
	int comp_clen;
#endif /* USE_TCP */

	/* Calculate message length difference caused by lumps modifying message
	 * body, from this point on the message body must not be modified. Zero
	 * value indicates that the body hasn't been modified
	*/

	clen_buf = 0;
	anchor = 0;
	body_only = 1;

	/* check to see if we need to add clen */
#ifdef USE_TCP
	if(proto == PROTO_TCP
#ifdef USE_TLS
			|| proto == PROTO_TLS
#endif
	) {
		if(parse_headers(msg, HDR_CONTENTLENGTH_F, 0) == -1) {
			LM_ERR("error parsing content-length\n");
			goto error;
		}
		if(unlikely(msg->content_length == 0)) {
			/* not present, we need to add it */
			/* msg->unparsed should point just before the final crlf
			 * - whole message was parsed by the above parse_headers
			 *   which did not find content-length */
			anchor = anchor_lump(
					msg, msg->unparsed - msg->buf, 0, HDR_CONTENTLENGTH_T);
			if(anchor == 0) {
				LM_ERR("cannot set clen anchor\n");
				goto error;
			}
			body_only = 0;
		} else {
			/* compute current content length and compare it with the
			   one in the message */
			body = get_body(msg);
			if(unlikely(body == 0)) {
				ser_error = E_BAD_REQ;
				LM_ERR("no message body found (missing crlf?)");
				goto error;
			}
			comp_clen = msg->len - (int)(body - msg->buf) + body_delta;
			if(comp_clen != (int)(long)msg->content_length->parsed) {
				/* note: we don't distinguish here between received with
				   wrong content-length and content-length changed, we just
				   fix it automatically in both cases (the reason being
				   that an error message telling we have received a msg-
				   with wrong content-length is of very little use) */
				anchor = del_lump(msg, msg->content_length->body.s - msg->buf,
						msg->content_length->body.len, HDR_CONTENTLENGTH_T);
				if(anchor == 0) {
					LM_ERR("Can't remove original Content-Length\n");
					goto error;
				}
				body_only = 1;
			}
		}
	} else
#endif /* USE_TCP */
		if(body_delta) {
			if(parse_headers(msg, HDR_CONTENTLENGTH_F, 0) == -1) {
				LM_ERR("Error parsing Content-Length\n");
				goto error;
			}

			/* The body has been changed, try to find
		 * existing Content-Length
		 */
			/* no need for Content-Length if it's an UDP packet and
		 * it hasn't Content-Length already */
			if(msg->content_length == 0) {
				/* content-length doesn't exist, append it */
				/* msg->unparsed should point just before the final crlf
			 * - whole message was parsed by the above parse_headers
			 *   which did not find content-length */
				if(proto != PROTO_UDP) {
					anchor = anchor_lump(msg, msg->unparsed - msg->buf, 0,
							HDR_CONTENTLENGTH_T);
					if(anchor == 0) {
						LM_ERR("cannot set clen anchor\n");
						goto error;
					}
					body_only = 0;
				} /* else
				LM_DBG("UDP packet with no clen => not adding one \n"); */
			} else {
				/* Content-Length has been found, remove it */
				anchor = del_lump(msg, msg->content_length->body.s - msg->buf,
						msg->content_length->body.len, HDR_CONTENTLENGTH_T);
				if(anchor == 0) {
					LM_ERR("Can't remove original Content-Length\n");
					goto error;
				}
			}
		}

	if(anchor) {
		clen_buf = clen_builder(msg, &clen_len, body_delta, body_only);
		if(!clen_buf)
			goto error;
		if(insert_new_lump_after(
				   anchor, clen_buf, clen_len, HDR_CONTENTLENGTH_T)
				== 0)
			goto error;
	}

	return 0;
error:
	if(clen_buf)
		pkg_free(clen_buf);
	return -1;
}

static inline int find_line_start(
		char *text, unsigned int text_len, char **buf, unsigned int *buf_len)
{
	char *ch, *start;
	unsigned int len;

	start = *buf;
	len = *buf_len;

	while(text_len <= len) {
		if(strncmp(text, start, text_len) == 0) {
			*buf = start;
			*buf_len = len;
			return 1;
		}
		if((ch = memchr(start, 13, len - 1))) {
			if(*(ch + 1) != 10) {
				LM_ERR("No LF after CR\n");
				return 0;
			}
			len = len - (ch - start + 2);
			start = ch + 2;
		} else {
			LM_ERR("No CRLF found\n");
			return 0;
		}
	}
	return 0;
}

static inline int get_line(str s)
{
	char *ch;

	if((ch = memchr(s.s, 13, s.len))) {
		if(*(ch + 1) != 10) {
			LM_ERR("No LF after CR\n");
			return 0;
		}
		return ch - s.s + 2;
	} else {
		LM_ERR("No CRLF found\n");
		return s.len;
	}
	return 0;
}

int replace_body(struct sip_msg *msg, str txt)
{
	struct lump *anchor;
	char *buf;
	str body = {0, 0};

	body.s = get_body(msg);
	if(body.s == 0) {
		LM_ERR("malformed sip message\n");
		return 0;
	}
	body.len = msg->len - (int)(body.s - msg->buf);
	LM_DBG("old size body[%d] actual[%d]\n", body.len, txt.len);
	if(body.s + body.len > msg->buf + msg->len) {
		LM_ERR("invalid content length: %d\n", body.len);
		return 0;
	}
	del_nonshm_lump(&(msg->body_lumps));
	msg->body_lumps = NULL;

	if(del_lump(msg, body.s - msg->buf, body.len, 0) == 0) {
		LM_ERR("cannot delete existing body");
		return 0;
	}

	anchor = anchor_lump(msg, body.s - msg->buf, 0, 0);
	if(anchor == 0) {
		LM_ERR("failed to get anchor\n");
		return 0;
	}

	buf = pkg_malloc(sizeof(char) * txt.len);
	if(buf == 0) {
		PKG_MEM_ERROR;
		return 0;
	}
	memcpy(buf, txt.s, txt.len);
	if(insert_new_lump_after(anchor, buf, txt.len, 0) == 0) {
		LM_ERR("failed to insert body lump\n");
		pkg_free(buf);
		return 0;
	}
	return 1;
}

/**
 * returns the boundary defined by the Content-Type
 * header
 */
int get_boundary(struct sip_msg *msg, str *boundary)
{
	str params;
	param_t *p, *list;
	param_hooks_t hooks;

	params.s =
			memchr(msg->content_type->body.s, ';', msg->content_type->body.len);
	if(params.s == NULL) {
		LM_INFO("Content-Type hdr has no boundary params <%.*s>\n",
				msg->content_type->body.len, msg->content_type->body.s);
		return -2;
	}
	params.len = msg->content_type->body.len
				 - (params.s - msg->content_type->body.s);
	if(parse_params(&params, CLASS_ANY, &hooks, &list) < 0) {
		LM_ERR("while parsing Content-Type params\n");
		return -1;
	}
	boundary->s = NULL;
	boundary->len = 0;
	for(p = list; p; p = p->next) {
		if((p->name.len == 8) && (strncasecmp(p->name.s, "boundary", 8) == 0)) {
			boundary->s = pkg_malloc(p->body.len + 2);
			if(boundary->s == NULL) {
				free_params(list);
				PKG_MEM_ERROR;
				return -1;
			}
			*(boundary->s) = '-';
			*(boundary->s + 1) = '-';
			memcpy(boundary->s + 2, p->body.s, p->body.len);
			boundary->len = 2 + p->body.len;
			LM_DBG("boundary is <%.*s>\n", boundary->len, boundary->s);
			break;
		}
	}
	free_params(list);
	return 0;
}

int check_boundaries(struct sip_msg *msg, struct dest_info *send_info)
{
	str b = {0, 0};
	str fb = {0, 0};
	str ob = {0, 0};
	str bsuffix = {"\r\n", 2};
	str fsuffix = {"--\r\n", 4};
	str body = {0, 0};
	str buf = {0, 0};
	str tmp = {0, 0};
	struct str_list *lb = NULL;
	struct str_list *lb_t = NULL;
	int lb_found = 0;
	int t, ret, lb_size;
	char *pb;

	if(!(msg->msg_flags & FL_BODY_MULTIPART)) {
		LM_DBG("no multi-part body\n");
		return 0;
	} else {
		if((t = get_boundary(msg, &ob)) != 0) {
			if(t == -2) {
				LM_INFO("no boundary - maybe just turning into multipart "
						"body\n");
				return -2;
			}
			return -1;
		}
		buf.s = build_body(msg, (unsigned int *)&buf.len, &ret, send_info);
		if(ret) {
			LM_ERR("Can't get body\n");
			return -1;
		}
		tmp.s = buf.s;
		t = tmp.len = buf.len;
		if(str_append(&ob, &bsuffix, &b) != 0) {
			LM_ERR("Can't append suffix to boundary\n");
			goto error;
		}
		if(str_append(&ob, &fsuffix, &fb) != 0) {
			LM_ERR("Can't append suffix to final boundary\n");
			goto error;
		}
		ret = b.len - 2;
		while(t > 0) {
			if(find_line_start(b.s, ret, &tmp.s, (unsigned int *)&tmp.len)) {
				/*LM_DBG("found t[%d] tmp.len[%d]:[%.*s]\n",
					t, tmp.len, tmp.len, tmp.s);*/
				if(!lb) {
					lb = pkg_malloc(sizeof(struct str_list));
					if(!lb) {
						PKG_MEM_ERROR;
						goto error;
					}
					lb->s.s = tmp.s;
					lb->s.len = tmp.len;
					lb->next = 0;
					lb_t = lb;
				} else {
					lb_t = append_str_list(tmp.s, tmp.len, &lb_t, &lb_size);
				}
				lb_found = lb_found + 1;
				tmp.s = tmp.s + ret;
				t = t - ret;
				tmp.len = tmp.len - ret;
			} else {
				t = 0;
			}
		}
		if(lb_found < 2) {
			LM_ERR("found[%d] wrong number of boundaries\n", lb_found);
			goto error;
		}
		/* adding 2 chars in advance */
		body.len = buf.len + 2;
		body.s = pkg_malloc(sizeof(char) * body.len);
		if(!body.s) {
			PKG_MEM_ERROR;
			goto error;
		}
		pb = body.s;
		body.len = 0;
		lb_t = lb;
		while(lb_t) {
			tmp.s = lb_t->s.s;
			tmp.len = lb_t->s.len;
			tmp.len = get_line(lb_t->s);
			if(tmp.len != b.len || strncmp(b.s, tmp.s, b.len) != 0) {
				LM_DBG("malformed boundary in the middle\n");
				memcpy(pb, b.s, b.len);
				body.len = body.len + b.len;
				pb = pb + b.len;
				t = lb_t->next->s.s - (lb_t->s.s + tmp.len);
				memcpy(pb, lb_t->s.s + tmp.len, t);
				pb = pb + t;
				/*LM_DBG("new chunk[%d][%.*s]\n", t, t, pb-t);*/
			} else {
				t = lb_t->next->s.s - lb_t->s.s;
				memcpy(pb, lb_t->s.s, t);
				/*LM_DBG("copy[%d][%.*s]\n", t, t, pb);*/
				pb = pb + t;
			}
			body.len = body.len + t;
			/*LM_DBG("body[%d][%.*s]\n", body.len, body.len, body.s);*/
			lb_t = lb_t->next;
			if(!lb_t->next)
				lb_t = NULL;
		}
		/* last boundary */
		tmp.s = lb->s.s;
		tmp.len = lb->s.len;
		tmp.len = get_line(lb->s);
		if(tmp.len != fb.len || strncmp(fb.s, tmp.s, fb.len) != 0) {
			LM_DBG("last bondary without -- at the end\n");
			memcpy(pb, fb.s, fb.len);
			/*LM_DBG("new chunk[%d][%.*s]\n", fb.len, fb.len, pb);*/
			pb = pb + fb.len;
			body.len = body.len + fb.len;
		} else {
			memcpy(pb, lb->s.s, lb->s.len);
			pb = pb + lb->s.len;
			body.len = body.len + lb->s.len;
			/*LM_DBG("copy[%d][%.*s]\n", lb->s.len, lb->s.len, pb - lb->s.len);*/
		}
		/*LM_DBG("body[%d][%.*s] expected[%ld]\n",
			body.len, body.len, body.s, pb-body.s); */
		if(!replace_body(msg, body)) {
			LM_ERR("Can't replace body\n");
			goto error;
		}
		msg->msg_flags &= ~FL_BODY_MULTIPART;
		ret = 1;
		goto clean;
	}

error:
	ret = -1;
clean:
	if(ob.s)
		pkg_free(ob.s);
	if(b.s)
		pkg_free(b.s);
	if(fb.s)
		pkg_free(fb.s);
	if(body.s)
		pkg_free(body.s);
	if(buf.s)
		pkg_free(buf.s);
	while(lb) {
		lb_t = lb->next;
		pkg_free(lb);
		lb = lb_t;
	}
	return ret;
}

/** builds a request in memory from another sip request.
  *
  * Side-effects: - it adds lumps to the msg which are _not_ cleaned.
  * The added lumps are HDR_VIA_T (almost always added), HDR_CONTENTLENGTH_T
  * and HDR_ROUTE_T (when a Route: header is added as a result of a non-null
  * msg->path_vec).
  *               - it might change send_info->proto and send_info->send_socket
  *                 if proto fallback is enabled (see below).
  *
  * Uses also global_req_flags ( OR'ed with msg->msg_flags, see send_info
  * below).
  *
  * @param msg  - sip message structure, complete with lumps
  * @param returned_len - result length (filled in)
  * @param send_info  - dest_info structure (value/result), contains where the
  *                     packet will be sent to (it's needed for building a
  *                     correct via, fill RR lumps a.s.o.). If MTU based
  *                     protocol fall-back is enabled (see flags below),
  *                     send_info->proto might be updated with the new
  *                     protocol.
  *                     msg->msg_flags used:
  *                     - FL_TCP_MTU_FB, FL_TLS_MTU_FB and FL_SCTP_MTU_FB -
  *                       fallback to the corresp. proto if the built
  *                       message > mtu and send_info->proto==PROTO_UDP.
  *                       It will also update send_info->proto.
  *                     - FL_FORCE_RPORT: add rport to via
  * @param mode - flags for building the message, can be a combination of:
  *                 * BUILD_NO_LOCAL_VIA - don't add a local via
  *                 * BUILD_NO_VIA1_UPDATE - don't update first via (rport,
  *                    received a.s.o)
  *                 * BUILD_NO_PATH - don't add a Route: header with the
  *                   msg->path_vec content.
  *                 * BUILD_IN_SHM - build the result in shm memory
  *
  * @return pointer to the new request (pkg_malloc'ed or shm_malloc'ed,
  * depending on the presence of the BUILD_IN_SHM flag, needs freeing when
  *   done) and sets returned_len or 0 on error.
  */
char *build_req_buf_from_sip_req(struct sip_msg *msg,
		unsigned int *returned_len, struct dest_info *send_info,
		unsigned int mode)
{
	unsigned int len, new_len, received_len, rport_len, uri_len, via_len,
			body_delta;
	char *line_buf;
	char *received_buf;
	char *rport_buf;
	char *new_buf;
	char *buf;
	str path_buf;
	unsigned int offset, s_offset, size;
	struct lump *via_anchor;
	struct lump *via_lump;
	struct lump *via_rm;
	struct lump *via_insert_param;
	struct lump *path_anchor;
	struct lump *path_lump;
	str branch;
	msg_flags_t flags;
	unsigned int udp_mtu;
	struct dest_info di;
	int ret;

	via_insert_param = 0;
	uri_len = 0;
	buf = msg->buf;
	len = msg->len;
	received_len = 0;
	rport_len = 0;
	new_buf = 0;
	received_buf = 0;
	rport_buf = 0;
	via_anchor = 0;
	line_buf = 0;
	via_len = 0;
	path_buf.s = 0;
	path_buf.len = 0;

	flags = msg->msg_flags | global_req_flags;
	if((ret = check_boundaries(msg, send_info)) < 0) {
		LM_INFO("check boundaries negative (%d)\n", ret);
	}

	/* Calculate message body difference and adjust Content-Length */
	body_delta = lumps_len(msg, msg->body_lumps, send_info);
	if(adjust_clen(msg, body_delta, send_info->proto) < 0) {
		LM_ERR("Error while adjusting Content-Length\n");
		goto error00;
	}

	if(unlikely(mode & BUILD_NO_LOCAL_VIA))
		goto after_local_via;

	/* create the via header */
	branch.s = msg->add_to_branch_s;
	branch.len = msg->add_to_branch_len;

	via_anchor = anchor_lump(msg, msg->via1->hdr.s - buf, 0, HDR_VIA_T);
	if(unlikely(via_anchor == 0))
		goto error00;
	line_buf = create_via_hf(&via_len, msg, send_info, &branch);
	if(unlikely(!line_buf)) {
		LM_ERR("could not create Via header\n");
		goto error00;
	}
	if(unlikely(mode & BUILD_NEW_LOCAL_VIA)) {
		/* delete exiting top Via header */
		via_rm = del_lump(
				msg, msg->h_via1->name.s - msg->buf, msg->h_via1->len, 0);
		if(via_rm == 0) {
			LM_ERR("failed to remove exiting Via header\n");
			goto error00;
		}
		/* do not update old Via header anymore */
		mode |= BUILD_NO_VIA1_UPDATE;
	}
after_local_via:
	if(unlikely(mode & BUILD_NO_VIA1_UPDATE))
		goto after_update_via1;
	/* check if received needs to be added */
	if(received_test(msg)) {
		if((received_buf = received_builder(msg, &received_len)) == 0) {
			LM_ERR("received_builder failed\n");
			goto error00; /* free also line_buf */
		}
	}

	/* check if rport needs to be updated */
	if(rport_test(msg)) {
		if((rport_buf = rport_builder(msg, &rport_len)) == 0) {
			LM_ERR("rport_builder failed\n");
			goto error00; /* free everything */
		}
	}

	/* find out where the offset of the first parameter that should be added
	 * (after host:port), needed by add receive & maybe rport */
	if(msg->via1->params.s) {
		size = msg->via1->params.s - msg->via1->hdr.s - 1; /*compensate
														  for ';' */
	} else {
		size = msg->via1->host.s - msg->via1->hdr.s + msg->via1->host.len;
		if(msg->via1->port != 0) {
			/*size+=strlen(msg->via1->hdr.s+size+1)+1;*/
			size += msg->via1->port_str.len + 1; /* +1 for ':'*/
		}
#if 0
			/* no longer necessary, now hots.s contains [] */
			if(send_sock->address.af==AF_INET6) size+=1; /* +1 for ']'*/
#endif
	}
	/* if received needs to be added, add anchor after host and add it, or
	 * overwrite the previous one if already present */
	if(received_buf) {
		if(msg->via1->received) { /* received already present => overwrite it*/
			via_insert_param =
					del_lump(msg, msg->via1->received->start - buf - 1, /*;*/
							msg->via1->received->size + 1, /*;*/ HDR_VIA_T);
		} else if(via_insert_param == 0) { /* receive not present, ok */
			via_insert_param = anchor_lump(
					msg, msg->via1->hdr.s - buf + size, 0, HDR_VIA_T);
		}
		if(via_insert_param == 0)
			goto error00; /* free received_buf */
		if(insert_new_lump_after(
				   via_insert_param, received_buf, received_len, HDR_VIA_T)
				== 0) {
			goto error00; /* free received_buf */
		}
		received_buf = NULL;
	}
	/* if rport needs to be updated, delete it if present and add its value */
	if(rport_buf) {
		if(msg->via1->rport) { /* rport already present */
			via_insert_param =
					del_lump(msg, msg->via1->rport->start - buf - 1, /*';'*/
							msg->via1->rport->size + 1 /* ; */, HDR_VIA_T);
		} else if(via_insert_param == 0) { /*force rport, no rport present */
			/* no rport, add it */
			via_insert_param = anchor_lump(
					msg, msg->via1->hdr.s - buf + size, 0, HDR_VIA_T);
		}
		if(via_insert_param == 0)
			goto error00; /* free rport_buf */
		if(insert_new_lump_after(
				   via_insert_param, rport_buf, rport_len, HDR_VIA_T)
				== 0) {
			goto error00; /* free rport_buf */
		}
		rport_buf = NULL;
	}

after_update_via1:
	/* add route with path content */
	if(unlikely(!(mode & BUILD_NO_PATH) && msg->path_vec.s
				&& msg->path_vec.len)) {
		path_buf.len = ROUTE_PREFIX_LEN + msg->path_vec.len + CRLF_LEN;
		path_buf.s = pkg_malloc(path_buf.len + 1);
		if(unlikely(path_buf.s == 0)) {
			PKG_MEM_ERROR;
			ser_error = E_OUT_OF_MEM;
			goto error00;
		}
		memcpy(path_buf.s, ROUTE_PREFIX, ROUTE_PREFIX_LEN);
		memcpy(path_buf.s + ROUTE_PREFIX_LEN, msg->path_vec.s,
				msg->path_vec.len);
		memcpy(path_buf.s + ROUTE_PREFIX_LEN + msg->path_vec.len, CRLF,
				CRLF_LEN);
		path_buf.s[path_buf.len] = 0;
		/* insert Route header either before the other routes
		   (if present & parsed), after the local via or after in front of
		    the first via if we don't add a local via*/
		if(msg->route) {
			path_anchor =
					anchor_lump(msg, msg->route->name.s - buf, 0, HDR_ROUTE_T);
		} else if(likely(via_anchor)) {
			path_anchor = via_anchor;
		} else if(likely(msg->via1)) {
			path_anchor =
					anchor_lump(msg, msg->via1->hdr.s - buf, 0, HDR_ROUTE_T);
		} else {
			/* if no via1 (theoretically possible for non-sip messages,
			   e.g. http xmlrpc) */
			path_anchor = anchor_lump(
					msg, msg->headers->name.s - buf, 0, HDR_ROUTE_T);
		}
		if(unlikely(path_anchor == 0))
			goto error00;
		if(unlikely((path_lump = insert_new_lump_after(path_anchor, path_buf.s,
							 path_buf.len, HDR_ROUTE_T))
					== 0)) {
			goto error00;
		}
		path_buf.s = NULL;
	}
	/* compute new msg len and fix overlapping zones*/
	new_len =
			len + body_delta + lumps_len(msg, msg->add_rm, send_info) + via_len;
#ifdef XL_DEBUG
	LM_ERR("new_len(%d)=len(%d)+lumps_len\n", new_len, len);
#endif
	udp_mtu = cfg_get(core, core_cfg, udp_mtu);
	di.proto = PROTO_NONE;
	if(unlikely((send_info->proto == PROTO_UDP) && udp_mtu
				&& (flags & FL_MTU_FB_MASK) && (new_len > udp_mtu)
				&& (!(mode & BUILD_NO_LOCAL_VIA)))) {

		di = *send_info; /* copy whole struct - will be used in the Via builder */
		di.proto = PROTO_NONE; /* except the proto */
#ifdef USE_TCP
		if(!tcp_disable && (flags & FL_MTU_TCP_FB)
				&& (di.send_sock = get_send_socket(
							msg, &send_info->to, PROTO_TCP))) {
			di.proto = PROTO_TCP;
		}
#ifdef USE_TLS
		else if(!tls_disable && (flags & FL_MTU_TLS_FB)
				&& (di.send_sock = get_send_socket(
							msg, &send_info->to, PROTO_TLS))) {
			di.proto = PROTO_TLS;
		}
#endif /* USE_TLS */
#endif /* USE_TCP */
#ifdef USE_SCTP
#ifdef USE_TCP
		else
#endif /* USE_TCP */
			if(!sctp_disable && (flags & FL_MTU_SCTP_FB)
					&& (di.send_sock = get_send_socket(
								msg, &send_info->to, PROTO_SCTP))) {
				di.proto = PROTO_SCTP;
			}
#endif /* USE_SCTP */

		if(di.proto != PROTO_NONE) {
			new_len -= via_len;
			if(likely(line_buf))
				pkg_free(line_buf);
			line_buf = create_via_hf(&via_len, msg, &di, &branch);
			if(!line_buf) {
				LM_ERR("memory allocation failure!\n");
				goto error00;
			}
			new_len += via_len;
		}
	}
	/* add via header to the list */
	/* try to add it before msg. 1st via */
	/* add first via, as an anchor for second via*/
	if(likely(line_buf)) {
		if((via_lump = insert_new_lump_before(
					via_anchor, line_buf, via_len, HDR_VIA_T))
				== 0) {
			goto error00;
		}
		line_buf = 0;
	}
	if(msg->new_uri.s) {
		uri_len = msg->new_uri.len;
		new_len = new_len - msg->first_line.u.request.uri.len + uri_len;
	}
	if(unlikely(mode & BUILD_IN_SHM))
		new_buf = (char *)shm_malloc(new_len + 1);
	else
		new_buf = (char *)pkg_malloc(new_len + 1);
	if(new_buf == 0) {
		ser_error = E_OUT_OF_MEM;
		if(unlikely(mode & BUILD_IN_SHM)) {
			SHM_MEM_ERROR;
		} else {
			PKG_MEM_ERROR;
		}
		goto error00;
	}

	offset = s_offset = 0;
	if(msg->new_uri.s) {
		/* copy message up to uri */
		size = msg->first_line.u.request.uri.s - buf;
		memcpy(new_buf, buf, size);
		offset += size;
		s_offset += size;
		/* add our uri */
		memcpy(new_buf + offset, msg->new_uri.s, uri_len);
		offset += uri_len;
		s_offset += msg->first_line.u.request.uri.len; /* skip original uri */
	}
	new_buf[new_len] = 0;
	/* copy msg adding/removing lumps */
	process_lumps(msg, msg->add_rm, new_buf, &offset, &s_offset, send_info,
			FLAG_MSG_ALL);
	process_lumps(msg, msg->body_lumps, new_buf, &offset, &s_offset, send_info,
			FLAG_MSG_ALL);
	/* copy the rest of the message */
	memcpy(new_buf + offset, buf + s_offset, len - s_offset);
	new_buf[new_len] = 0;

	/* update the send_info if udp_mtu affected */
	if(di.proto != PROTO_NONE) {
		send_info->proto = di.proto;
		send_info->send_sock = di.send_sock;
	}

#ifdef DBG_MSG_QA
	if(new_buf[new_len - 1] == 0) {
		LM_ERR("0 in the end\n");
		abort();
	}
#endif

	*returned_len = new_len;
	return new_buf;

error00:
	if(received_buf)
		pkg_free(received_buf);
	if(rport_buf)
		pkg_free(rport_buf);
	if(path_buf.s)
		pkg_free(path_buf.s);
	if(line_buf)
		pkg_free(line_buf);

	*returned_len = 0;
	return 0;
}

char *generate_res_buf_from_sip_res(
		struct sip_msg *msg, unsigned int *returned_len, unsigned int mode)
{
	unsigned int new_len, via_len, body_delta;
	char *new_buf;
	unsigned offset, s_offset, via_offset;
	char *buf;
	unsigned int len;
	str xparams;
	str sdup;
	sr_lump_t *anchor;

	buf = msg->buf;
	len = msg->len;
	new_buf = 0;

	if(unlikely(mode & BUILD_NO_VIA1_UPDATE)) {
		via_len = 0;
		via_offset = 0;
	} else {
		/* we must remove the first via */
		if(msg->via1->next) {
			via_len = msg->via1->bsize;
			via_offset = msg->h_via1->body.s - buf;
		} else {
			via_len = msg->h_via1->len;
			via_offset = msg->h_via1->name.s - buf;
		}
	}

	/* test and add xavp via reply params */
	if(msg->via2 && (msg->msg_flags & FL_ADD_XAVP_VIA_REPLY_PARAMS)
			&& _ksr_xavp_via_reply_params.len > 0) {
		xparams.s = pv_get_buffer();
		xparams.len = xavp_serialize_fields_style(&_ksr_xavp_via_reply_params,
				1, xparams.s, pv_get_buffer_size());
		if(xparams.len > 0) {
			LM_DBG("adding via reply xavp params\n");
			anchor = anchor_lump(msg,
					msg->via2->params.s + msg->via2->params.len - msg->buf, 0,
					0);
			if(anchor == NULL) {
				LM_ERR("unable to get the anchor\n");
				goto error;
			}
			if(pkg_str_dup(&sdup, &xparams) < 0) {
				PKG_MEM_ERROR;
				goto error;
			}
			if(insert_new_lump_after(anchor, sdup.s, sdup.len, 0) == 0) {
				LM_ERR("unable to add via reply xavp params\n");
				pkg_free(sdup.s);
				goto error;
			}
		}
	}

	/* Calculate message body difference and adjust
	      * Content-Length
	      */
	body_delta = lumps_len(msg, msg->body_lumps, 0);
	if(adjust_clen(msg, body_delta, (msg->via2 ? msg->via2->proto : PROTO_UDP))
			< 0) {
		LM_ERR("error while adjusting Content-Length\n");
		goto error;
	}

	if(likely(!(mode & BUILD_NO_VIA1_UPDATE))) {
		/* remove the first via*/
		if(del_lump(msg, via_offset, via_len, HDR_VIA_T) == 0) {
			LM_ERR("error trying to remove first via\n");
			goto error;
		}
	}

	/* note: unknow the send sock */
	new_len = len + body_delta + lumps_len(msg, msg->add_rm, 0);

	LM_DBG("old size: %d, new size: %d\n", len, new_len);
	new_buf = (char *)pkg_malloc(new_len + 1); /* +1 is for debugging
											 (\0 to print it )*/
	if(new_buf == 0) {
		PKG_MEM_ERROR;
		goto error;
	}
	new_buf[new_len] = 0; /* debug: print the message */
	offset = s_offset = 0;
	/* note: no send sock*/
	process_lumps(
			msg, msg->add_rm, new_buf, &offset, &s_offset, 0, FLAG_MSG_ALL);
	process_lumps(
			msg, msg->body_lumps, new_buf, &offset, &s_offset, 0, FLAG_MSG_ALL);
	/* copy the rest of the message */
	memcpy(new_buf + offset, buf + s_offset, len - s_offset);
	/* send it! */
	LM_DBG("copied size: orig:%d, new: %d, rest: %d msg=\n%s\n", s_offset,
			offset, len - s_offset, new_buf);

	*returned_len = new_len;
	return new_buf;
error:
	*returned_len = 0;
	return 0;
}

char *build_res_buf_from_sip_res(
		struct sip_msg *msg, unsigned int *returned_len)
{
	return generate_res_buf_from_sip_res(msg, returned_len, 0);
}

char *build_res_buf_from_sip_req(unsigned int code, str *text, str *new_tag,
		struct sip_msg *msg, unsigned int *returned_len, struct bookmark *bmark)
{
	char *buf, *p;
	unsigned int len, foo;
	struct hdr_field *hdr;
	struct lump_rpl *lump;
	struct lump_rpl *body;
	int i;
	char *received_buf;
	unsigned int received_len;
	char *rport_buf;
	unsigned int rport_len;
	char *warning_buf;
	unsigned int warning_len;
	char *content_len_buf;
	unsigned int content_len_len;
	char *after_body;
	str to_tag;
	char *totags;
	int httpreq;
	char *pvia;
	str xparams = STR_NULL;

	body = 0;
	buf = 0;
	received_buf = rport_buf = warning_buf = content_len_buf = 0;
	received_len = rport_len = warning_len = content_len_len = 0;

	to_tag.s = 0; /* fixes gcc 4.0 warning */
	to_tag.len = 0;

	/* force parsing all headers -- we want to return all
	Via's in the reply and they may be scattered down to the
	end of header (non-block Vias are a really poor property
	of SIP :( ) */
	if(parse_headers(msg, HDR_EOH_F, 0) == -1) {
		LM_ERR("alas, parse_headers failed\n");
		goto error00;
	}

	/*computes the length of the new response buffer*/
	len = 0;

	httpreq = IS_HTTP(msg);

	/* check if received needs to be added */
	if(received_test(msg)) {
		if((received_buf = received_builder(msg, &received_len)) == 0) {
			LM_ERR("alas, received_builder failed\n");
			goto error00;
		}
	}
	/* check if rport needs to be updated */
	if(rport_test(msg)) {
		if((rport_buf = rport_builder(msg, &rport_len)) == 0) {
			LM_ERR("rport_builder failed\n");
			goto error01; /* free everything */
		}
		if(msg->via1->rport)
			len -= msg->via1->rport->size + 1; /* include ';' */
	}

	/* test and add xavp via reply params */
	if((msg->msg_flags & FL_ADD_XAVP_VIA_REPLY_PARAMS)
			&& _ksr_xavp_via_reply_params.len > 0) {
		xparams.s = pv_get_buffer();
		xparams.len = xavp_serialize_fields_style(&_ksr_xavp_via_reply_params,
				1, xparams.s, pv_get_buffer_size());
		if(xparams.len > 0) {
			len += xparams.len; /* starting ';' included */
		}
	}

	/* first line */
	len += msg->first_line.u.request.version.len
		   + 1 /*space*/ + 3 /*code*/ + 1 /*space*/ + text->len
		   + CRLF_LEN /*new line*/;
	/*headers that will be copied (TO, FROM, CSEQ,CALLID,VIA)*/
	for(hdr = msg->headers; hdr; hdr = hdr->next) {
		switch(hdr->type) {
			case HDR_TO_T:
				if(new_tag && new_tag->len) {
					to_tag = get_to(msg)->tag_value;
					if(to_tag.len && to_tag.s)
						len += new_tag->len - to_tag.len;
					else
						len += new_tag->len + TOTAG_TOKEN_LEN /*";tag="*/;
				}
				len += hdr->len;
				break;
			case HDR_VIA_T:
				/* we always add CRLF to via*/
				len += (hdr->body.s + hdr->body.len) - hdr->name.s + CRLF_LEN;
				if(hdr == msg->h_via1)
					len += received_len + rport_len;
				break;
			case HDR_RECORDROUTE_T:
				/* RR only for 1xx and 2xx replies */
				if(code < 180 || code >= 300)
					break;
			case HDR_FROM_T:
			case HDR_CALLID_T:
			case HDR_CSEQ_T:
				/* we keep the original termination for these headers*/
				len += hdr->len;
				break;
			default:
					/* do nothing, we are interested only in the above headers */
					;
		}
	}
	/* lumps length */
	for(lump = msg->reply_lump; lump; lump = lump->next) {
		len += lump->text.len;
		if(lump->flags & LUMP_RPL_BODY)
			body = lump;
	}
	/* server header */
	if(server_signature && server_hdr.len)
		len += server_hdr.len + CRLF_LEN;
	/* warning hdr */
	if(sip_warning) {
		warning_buf = warning_builder(msg, &warning_len);
		if(warning_buf)
			len += warning_len + CRLF_LEN;
		else
			LM_WARN("warning skipped -- too big\n");
	}
	/* content length hdr */
	if(body) {
		content_len_buf = int2str(body->text.len, (int *)&content_len_len);
		len += CONTENT_LENGTH_LEN + content_len_len + CRLF_LEN;
	} else {
		len += CONTENT_LENGTH_LEN + 1 /*0*/ + CRLF_LEN;
	}
	/* end of message */
	len += CRLF_LEN; /*new line*/

	/*allocating mem*/
	buf = (char *)pkg_malloc(len + 1);
	if(!buf) {
		PKG_MEM_ERROR;
		goto error01;
	}

	/* filling the buffer*/
	p = buf;
	/* first line */
	memcpy(p, msg->first_line.u.request.version.s,
			msg->first_line.u.request.version.len);
	p += msg->first_line.u.request.version.len;
	*(p++) = ' ';
	/*code*/
	for(i = 2, foo = code; i >= 0; i--, foo = foo / 10)
		*(p + i) = '0' + foo - (foo / 10) * 10;
	p += 3;
	*(p++) = ' ';
	memcpy(p, text->s, text->len);
	p += text->len;
	memcpy(p, CRLF, CRLF_LEN);
	p += CRLF_LEN;
	/* headers*/
	for(hdr = msg->headers; hdr; hdr = hdr->next) {
		switch(hdr->type) {
			case HDR_VIA_T:
				/* if is HTTP, backup start of Via header in response */
				if(unlikely(httpreq))
					pvia = p;
				if(hdr == msg->h_via1) {
					if(rport_buf) {
						if(msg->via1->rport) { /* delete the old one */
							/* copy until rport */
							append_str_trans(p, hdr->name.s,
									msg->via1->rport->start - hdr->name.s - 1,
									msg);
							/* copy new rport */
							append_str(p, rport_buf, rport_len);
							/* copy the rest of the via */
							append_str_trans(p,
									msg->via1->rport->start
											+ msg->via1->rport->size,
									hdr->body.s + hdr->body.len
											- msg->via1->rport->start
											- msg->via1->rport->size,
									msg);
						} else { /* just append the new one */
							/* normal whole via copy */
							append_str_trans(p, hdr->name.s,
									(hdr->body.s + hdr->body.len) - hdr->name.s,
									msg);
							append_str(p, rport_buf, rport_len);
						}
					} else {
						/* normal whole via copy */
						append_str_trans(p, hdr->name.s,
								(hdr->body.s + hdr->body.len) - hdr->name.s,
								msg);
					}
					if(received_buf)
						append_str(p, received_buf, received_len);
				} else {
					/* normal whole via copy */
					append_str_trans(p, hdr->name.s,
							(hdr->body.s + hdr->body.len) - hdr->name.s, msg);
				}
				if(xparams.len > 0) {
					append_str(p, xparams.s, xparams.len);
				}
				append_str(p, CRLF, CRLF_LEN);
				/* if is HTTP, replace Via with Sia
				 * - HTTP Via format is different than SIP Via
				 */
				if(unlikely(httpreq))
					*pvia = 'S';
				break;
			case HDR_RECORDROUTE_T:
				/* RR only for 1xx and 2xx replies */
				if(code < 180 || code >= 300)
					break;
				append_str(p, hdr->name.s, hdr->len);
				break;
			case HDR_TO_T:
				if(new_tag && new_tag->len) {
					if(to_tag.len && to_tag.s) { /* replacement */
						/* before to-tag */
						append_str(p, hdr->name.s, to_tag.s - hdr->name.s);
						/* to tag replacement */
						bmark->to_tag_val.s = p;
						bmark->to_tag_val.len = new_tag->len;
						append_str(p, new_tag->s, new_tag->len);
						/* the rest after to-tag */
						append_str(p, to_tag.s + to_tag.len,
								hdr->name.s + hdr->len
										- (to_tag.s + to_tag.len));
					} else { /* adding a new to-tag */
						after_body = hdr->body.s + hdr->body.len;
						append_str(p, hdr->name.s, after_body - hdr->name.s);
						append_str(p, TOTAG_TOKEN, TOTAG_TOKEN_LEN);
						bmark->to_tag_val.s = p;
						bmark->to_tag_val.len = new_tag->len;
						append_str(p, new_tag->s, new_tag->len);
						append_str(p, after_body,
								hdr->name.s + hdr->len - after_body);
					}
					break;
				} /* no new to-tag -- proceed to 1:1 copying  */
				totags = ((struct to_body *)(hdr->parsed))->tag_value.s;
				if(totags) {
					bmark->to_tag_val.s = p + (totags - hdr->name.s);
					bmark->to_tag_val.len =
							((struct to_body *)(hdr->parsed))->tag_value.len;
				} else {
					bmark->to_tag_val.len = 0;
					bmark->to_tag_val.s =
							p + (hdr->body.s + hdr->body.len - hdr->name.s);
				}
				/* no break */
			case HDR_FROM_T:
			case HDR_CALLID_T:
			case HDR_CSEQ_T:
				append_str(p, hdr->name.s, hdr->len);
				break;
			default:
					/* do nothing, we are interested only in the above headers */
					;
		} /* end switch */
	}	  /* end for */
	/* lumps */
	for(lump = msg->reply_lump; lump; lump = lump->next)
		if(lump->flags & LUMP_RPL_HDR) {
			memcpy(p, lump->text.s, lump->text.len);
			p += lump->text.len;
		}
	/* server header */
	if(server_signature && server_hdr.len > 0) {
		memcpy(p, server_hdr.s, server_hdr.len);
		p += server_hdr.len;
		memcpy(p, CRLF, CRLF_LEN);
		p += CRLF_LEN;
	}
	/* content_length hdr */
	if(content_len_len) {
		append_str(p, CONTENT_LENGTH, CONTENT_LENGTH_LEN);
		append_str(p, content_len_buf, content_len_len);
		append_str(p, CRLF, CRLF_LEN);
	} else {
		append_str(
				p, CONTENT_LENGTH "0" CRLF, CONTENT_LENGTH_LEN + 1 + CRLF_LEN);
	}
	/* warning header */
	if(warning_buf) {
		memcpy(p, warning_buf, warning_len);
		p += warning_len;
		memcpy(p, CRLF, CRLF_LEN);
		p += CRLF_LEN;
	}
	/*end of message*/
	memcpy(p, CRLF, CRLF_LEN);
	p += CRLF_LEN;
	/* body */
	if(body) {
		memcpy(p, body->text.s, body->text.len);
		p += body->text.len;
	}

	if(len != p - buf)
		LM_CRIT("diff len=%d p-buf=%d\n", len, (int)(p - buf));

	*(p) = 0;
	*returned_len = len;
	/* in req2reply, received_buf is not introduced to lumps and
	   needs to be deleted here
	*/
	if(received_buf)
		pkg_free(received_buf);
	if(rport_buf)
		pkg_free(rport_buf);
	return buf;

error01:
	if(received_buf)
		pkg_free(received_buf);
	if(rport_buf)
		pkg_free(rport_buf);
error00:
	*returned_len = 0;
	return 0;
}


/* return number of chars printed or 0 if space exceeded;
   assumes buffer size of at least MAX_BRANCH_PARAM_LEN
 */
int branch_builder(unsigned int hash_index,
		/* only either parameter useful */
		unsigned int label, char *char_v, int branch, char *branch_str,
		int *len)
{

	char *begin;
	int size;

	/* hash id provided ... start with it */
	size = MAX_BRANCH_PARAM_LEN;
	begin = branch_str;
	*len = 0;

	memcpy(begin, MCOOKIE, MCOOKIE_LEN);
	size -= MCOOKIE_LEN;
	begin += MCOOKIE_LEN;

	if(int2reverse_hex(&begin, &size, hash_index) == -1)
		return 0;

	if(size) {
		*begin = BRANCH_SEPARATOR;
		begin++;
		size--;
	} else
		return 0;

	/* string with request's characteristic value ... use it ... */
	if(char_v) {
		if(memcpy(begin, char_v, MD5_LEN)) {
			begin += MD5_LEN;
			size -= MD5_LEN;
		} else
			return 0;
	} else { /* ... use the "label" value otherwise */
		if(int2reverse_hex(&begin, &size, label) == -1)
			return 0;
	}

	if(size) {
		*begin = BRANCH_SEPARATOR;
		begin++;
		size--;
	} else
		return 0;

	if(int2reverse_hex(&begin, &size, branch) == -1)
		return 0;

	*len = MAX_BRANCH_PARAM_LEN - size;
	return size;
}


/* uses only the send_info->send_socket, send_info->proto, send_info->id and
 * send_info->comp (so that a send_info used for sending can be passed
 * to this function w/o changes and the correct via will be built) */
char *via_builder(unsigned int *len, sip_msg_t *msg,
		struct dest_info *send_info /* where to send the reply */, str *branch,
		str *extra_params, struct hostport *hp)
{
	unsigned int via_len, extra_len;
	char *line_buf;
	int max_len;
	int via_prefix_len;
	str *address_str = NULL; /* address displayed in via */
	str *port_str = NULL;	 /* port no displayed in via */
	struct socket_info *send_sock;
	int comp_len, comp_name_len;
#ifdef USE_COMP
	char *comp_name;
#endif /* USE_COMP */
	int port;
	int proto;
	struct ip_addr ip;
	union sockaddr_union *from = NULL;
	union sockaddr_union local_addr;
	struct tcp_connection *con = NULL;
	sr_xavp_t *rxavp = NULL;
	str xname;

	send_sock = send_info->send_sock;
	/* use pre-set address in via, the outbound socket alias or address one */
	if(msg && (msg->msg_flags & FL_USE_XAVP_VIA_FIELDS)
			&& _ksr_xavp_via_fields.len > 0) {
		xname.s = "address";
		xname.len = 7;
		rxavp = xavp_get_child_with_sval(&_ksr_xavp_via_fields, &xname);
		if(rxavp != NULL) {
			address_str = &rxavp->val.v.s;
		}
	}
	if(address_str == NULL) {
		if(hp && hp->host->len)
			address_str = hp->host;
		else if(send_sock->useinfo.name.len > 0)
			address_str = &(send_sock->useinfo.name);
		else
			address_str = &(send_sock->address_str);
	}
	if(msg && (msg->msg_flags & FL_USE_XAVP_VIA_FIELDS)
			&& _ksr_xavp_via_fields.len > 0) {
		xname.s = "port";
		xname.len = 4;
		rxavp = xavp_get_child_with_sval(&_ksr_xavp_via_fields, &xname);
		if(rxavp != NULL) {
			port_str = &rxavp->val.v.s;
		}
	}
	if(port_str == NULL) {
		if(hp && hp->port->len) {
			port_str = hp->port;
		} else if(send_sock->useinfo.name.len > 0) {
			if(send_sock->useinfo.port_no > 0) {
				port_str = &(send_sock->useinfo.port_no_str);
			}
		} else {
			if(send_sock->port_no != SIP_PORT) {
				port_str = &(send_sock->port_no_str);
			}
		}
	}
	proto = PROTO_NONE;
	if(msg && (msg->msg_flags & FL_USE_XAVP_VIA_FIELDS)
			&& _ksr_xavp_via_fields.len > 0) {
		xname.s = "proto";
		xname.len = 5;
		rxavp = xavp_get_child_with_sval(&_ksr_xavp_via_fields, &xname);
		if(rxavp != NULL) {
			proto = get_valid_proto_id(&rxavp->val.v.s);
		}
	}
	if(proto == PROTO_NONE) {
		if(send_sock->useinfo.proto != PROTO_NONE) {
			proto = send_sock->useinfo.proto;
		} else {
			proto = send_info->proto;
		}
	}
	comp_len = comp_name_len = 0;
#ifdef USE_COMP
	comp_name = 0;
	switch(send_info->comp) {
		case COMP_NONE:
			break;
		case COMP_SIGCOMP:
			comp_len = COMP_PARAM_LEN;
			comp_name_len = SIGCOMP_NAME_LEN;
			comp_name = SIGCOMP_NAME;
			break;
		case COMP_SERGZ:
			comp_len = COMP_PARAM_LEN;
			comp_name_len = SERGZ_NAME_LEN;
			comp_name = SERGZ_NAME;
			break;
		default:
			LM_CRIT("unknown comp %d\n", send_info->comp);
			/* continue, we'll just ignore comp */
	}
#endif /* USE_COMP */

	via_prefix_len = MY_VIA_LEN + (proto == PROTO_SCTP);
	max_len = via_prefix_len + address_str->len /* space in MY_VIA */
			  + 2 /* just in case it is a v6 address ... [ ] */
			  + 1 /*':'*/ + (port_str ? port_str->len : 0)
			  + (branch ? (MY_BRANCH_LEN + branch->len) : 0)
			  + (extra_params ? extra_params->len : 0) + comp_len
			  + comp_name_len + CRLF_LEN + 1;
	line_buf = pkg_malloc(max_len);
	if(line_buf == 0) {
		ser_error = E_OUT_OF_MEM;
		PKG_MEM_ERROR;
		return 0;
	}

	extra_len = 0;

	via_len = via_prefix_len + address_str->len; /*space included in MY_VIA*/

	memcpy(line_buf, MY_VIA, MY_VIA_LEN);
	if(proto == PROTO_UDP) {
		/* do nothing */
	} else if(proto == PROTO_TCP) {
		memcpy(line_buf + MY_VIA_LEN - 4, "TCP ", 4);
	} else if(proto == PROTO_TLS) {
		memcpy(line_buf + MY_VIA_LEN - 4, "TLS ", 4);
	} else if(proto == PROTO_SCTP) {
		memcpy(line_buf + MY_VIA_LEN - 4, "SCTP ", 5);
	} else if(proto == PROTO_WS) {
		if(unlikely(send_info->send_flags.f & SND_F_FORCE_SOCKET
					&& send_info->send_sock)) {
			local_addr = send_info->send_sock->su;
			su_setport(&local_addr, 0); /* any local port will do */
			from = &local_addr;
		}

		port = su_getport(&send_info->to);
		if(likely(port)) {
			su2ip_addr(&ip, &send_info->to);
			con = tcpconn_get(send_info->id, &ip, port, from, 0);
		} else if(likely(send_info->id))
			con = tcpconn_get(send_info->id, 0, 0, 0, 0);
		else {
			LM_CRIT("null_id & to\n");
			pkg_free(line_buf);
			return 0;
		}

		if(con == NULL) {
			LM_WARN("TCP/TLS connection (id: %d) for WebSocket could not be "
					"found\n",
					send_info->id);
			pkg_free(line_buf);
			return 0;
		}

		if(con->rcv.proto == PROTO_WS) {
			memcpy(line_buf + MY_VIA_LEN - 4, "WS ", 3);
		} else if(con->rcv.proto == PROTO_WSS) {
			memcpy(line_buf + MY_VIA_LEN - 4, "WSS ", 4);
		} else {
			tcpconn_put(con);
			LM_CRIT("unknown proto %d\n", con->rcv.proto);
			pkg_free(line_buf);
			return 0;
		}
		tcpconn_put(con);
	} else if(proto == PROTO_WSS) {
		memcpy(line_buf + MY_VIA_LEN - 4, "WSS ", 4);
	} else {
		LM_CRIT("unknown proto %d\n", proto);
		pkg_free(line_buf);
		return 0;
	}
	/* add [] only if ipv6 address is used;
	 * if using pre-set no check is made */
	if(send_sock->address.af == AF_INET6) {
		/* lightweight safety checks if brackets set
		 * or non-ipv6 (e.g., advertised hostname) */
		if(address_str->s[0] != '['
				&& memchr(address_str->s, ':', address_str->len) != NULL) {
			line_buf[via_prefix_len] = '[';
			line_buf[via_prefix_len + 1 + address_str->len] = ']';
			extra_len = 1;
			via_len += 2; /* [ ]*/
		}
	}
	memcpy(line_buf + via_prefix_len + extra_len, address_str->s,
			address_str->len);
	if(port_str != NULL && port_str->len > 0) {
		line_buf[via_len] = ':';
		via_len++;
		memcpy(line_buf + via_len, port_str->s, port_str->len);
		via_len += port_str->len;
	}

	/* branch parameter */
	if(branch) {
		memcpy(line_buf + via_len, MY_BRANCH, MY_BRANCH_LEN);
		via_len += MY_BRANCH_LEN;
		memcpy(line_buf + via_len, branch->s, branch->len);
		via_len += branch->len;
	}
	/* extra params  */
	if(extra_params) {
		memcpy(line_buf + via_len, extra_params->s, extra_params->len);
		via_len += extra_params->len;
	}
#ifdef USE_COMP
	/* comp */
	if(comp_len) {
		memcpy(line_buf + via_len, COMP_PARAM, COMP_PARAM_LEN);
		via_len += COMP_PARAM_LEN;
		memcpy(line_buf + via_len, comp_name, comp_name_len);
		via_len += comp_name_len;
	}
#endif

	memcpy(line_buf + via_len, CRLF, CRLF_LEN);
	via_len += CRLF_LEN;
	line_buf[via_len] = 0; /* null terminate the string*/

	*len = via_len;
	return line_buf;
}

/* creates a via header honoring the protocol of the incoming socket
 * msg is an optional parameter */
char *create_via_hf(unsigned int *len, struct sip_msg *msg,
		struct dest_info *send_info /* where to send the reply */, str *branch)
{
	char *via;
	str extra_params;
	struct hostport hp;
	char sbuf[24];
	int slen;
	str xparams;
#if defined USE_TCP || defined USE_SCTP
	char *id_buf;
	unsigned int id_len;


	id_buf = 0;
	id_len = 0;
#endif
	extra_params.len = 0;
	extra_params.s = 0;


#if defined USE_TCP || defined USE_SCTP
	/* add id if tcp */
	if(msg
			&& (
#ifdef USE_TCP
					(msg->rcv.proto == PROTO_TCP)
#ifdef USE_TLS
					|| (msg->rcv.proto == PROTO_TLS)
#endif
#ifdef USE_SCTP
					||
#endif /* USE_SCTP */
#endif /* USE_TCP */
#ifdef USE_SCTP
					(msg->rcv.proto == PROTO_SCTP)
#endif /* USE_SCTP */
							)) {
		if((id_buf = id_builder(msg, &id_len)) == 0) {
			LM_ERR("id_builder failed\n");
			return 0; /* we don't need to free anything,
			                 nothing alloc'ed yet*/
		}
		LM_DBG("id added: <%.*s>, rcv proto=%d\n", (int)id_len, id_buf,
				msg->rcv.proto);
		extra_params.s = id_buf;
		extra_params.len = id_len;
	}
#endif /* USE_TCP || USE_SCTP */

	/* test and add rport parameter to local via - rfc3581 */
	if((ksr_local_rport) || (msg && (msg->msg_flags & FL_ADD_LOCAL_RPORT))) {
		/* params so far + ';rport' + '\0' */
		via = (char *)pkg_malloc(extra_params.len + RPORT_LEN);
		if(via == 0) {
			PKG_MEM_ERROR;
			if(extra_params.s)
				pkg_free(extra_params.s);
			return 0;
		}
		if(extra_params.s != NULL && extra_params.len > 0) {
			memcpy(via, extra_params.s, extra_params.len);
		}
		if(extra_params.s != NULL) {
			pkg_free(extra_params.s);
		}
		memcpy(via + extra_params.len, RPORT, RPORT_LEN - 1);
		extra_params.s = via;
		extra_params.len += RPORT_LEN - 1;
		extra_params.s[extra_params.len] = '\0';
	}

	/* test and add srvid parameter to local via  */
	if(msg && (msg->msg_flags & FL_ADD_SRVID) && server_id != 0) {
		slen = snprintf(sbuf, 24, ";srvid=%u", (unsigned int)server_id);
		if(slen <= 0 || slen >= 24) {
			LM_WARN("failed to build srvid parameter");
		} else {
			via = (char *)pkg_malloc(extra_params.len + slen + 1);
			if(via == 0) {
				PKG_MEM_ERROR;
				if(extra_params.s)
					pkg_free(extra_params.s);
				return 0;
			}
			if(extra_params.s != NULL && extra_params.len > 0) {
				memcpy(via, extra_params.s, extra_params.len);
			}
			if(extra_params.s != NULL) {
				pkg_free(extra_params.s);
			}
			memcpy(via + extra_params.len, sbuf, slen);
			extra_params.s = via;
			extra_params.len += slen;
			extra_params.s[extra_params.len] = '\0';
		}
	}

	/* test and add xavp params */
	if(msg && (msg->msg_flags & FL_ADD_XAVP_VIA_PARAMS)
			&& _ksr_xavp_via_params.len > 0) {
		xparams.s = pv_get_buffer();
		xparams.len = xavp_serialize_fields(
				&_ksr_xavp_via_params, xparams.s, pv_get_buffer_size());
		if(xparams.len > 0) {
			via = (char *)pkg_malloc(extra_params.len + xparams.len + 2);
			if(via == 0) {
				PKG_MEM_ERROR;
				if(extra_params.s)
					pkg_free(extra_params.s);
				return 0;
			}
			if(extra_params.s != NULL && extra_params.len > 0) {
				memcpy(via, extra_params.s, extra_params.len);
			}
			if(extra_params.s != NULL) {
				pkg_free(extra_params.s);
			}
			/* add ';' between via parameters */
			via[extra_params.len] = ';';
			/* skip last ';' from xavp serialized output */
			memcpy(via + extra_params.len + 1, xparams.s, xparams.len - 1);
			extra_params.s = via;
			extra_params.len += xparams.len;
			extra_params.s[extra_params.len] = '\0';
		}
	}

	set_hostport(&hp, msg);
	via = via_builder(len, msg, send_info, branch,
			extra_params.len ? &extra_params : 0, &hp);

	/* we do not need extra_params any more, already in the new via header */
	if(extra_params.s)
		pkg_free(extra_params.s);
	return via;
}

/* builds a char* buffer from message headers without body
 * first line is excluded in case of skip_first_line=1
 * error is set -1 if the memory allocation fails
 */
char *build_only_headers(struct sip_msg *msg, int skip_first_line,
		unsigned int *returned_len, int *error, struct dest_info *send_info)
{
	char *buf, *new_buf;
	unsigned int offset, s_offset, len, new_len;

	*error = 0;
	buf = msg->buf;
	if(skip_first_line)
		s_offset = msg->headers->name.s - buf;
	else
		s_offset = 0;

	/* original length without body, and without final \r\n */
	len = msg->unparsed - buf;
	/* new msg length */
	new_len = len -									  /* original length  */
			  s_offset +							  /* skipped first line */
			  lumps_len(msg, msg->add_rm, send_info); /* lumps */

	if(new_len == 0) {
		*returned_len = 0;
		return 0;
	}

	new_buf = (char *)pkg_malloc(new_len + 1);
	if(!new_buf) {
		PKG_MEM_ERROR;
		*error = -1;
		return 0;
	}
	new_buf[0] = 0;
	offset = 0;

	/* copy message lumps */
	process_lumps(msg, msg->add_rm, new_buf, &offset, &s_offset, send_info,
			FLAG_MSG_ALL);
	/* copy the rest of the message without body */
	if(len > s_offset) {
		memcpy(new_buf + offset, buf + s_offset, len - s_offset);
		offset += (len - s_offset);
	}
	new_buf[offset] = 0;

	*returned_len = offset;
	return new_buf;
}

/* builds a char* buffer from message body
 * error is set -1 if the memory allocation fails
 */
char *build_body(struct sip_msg *msg, unsigned int *returned_len, int *error,
		struct dest_info *send_info)
{
	char *buf, *new_buf, *body;
	unsigned int offset, s_offset, len, new_len;

	*error = 0;
	body = get_body(msg);

	if(!body || (body[0] == 0)) {
		*returned_len = 0;
		return 0;
	}
	buf = msg->buf;
	s_offset = body - buf;

	/* original length of msg with body */
	len = msg->len;
	/* new body length */
	new_len = len -										  /* original length  */
			  s_offset +								  /* msg without body */
			  lumps_len(msg, msg->body_lumps, send_info); /* lumps */

	new_buf = (char *)pkg_malloc(new_len + 1);
	if(!new_buf) {
		PKG_MEM_ERROR;
		*error = -1;
		return 0;
	}
	new_buf[0] = 0;
	offset = 0;

	/* copy body lumps */
	process_lumps(msg, msg->body_lumps, new_buf, &offset, &s_offset, send_info,
			FLAG_MSG_ALL);
	/* copy the rest of the message without body */
	if(len > s_offset) {
		memcpy(new_buf + offset, buf + s_offset, len - s_offset);
		offset += (len - s_offset);
	}
	new_buf[offset] = 0;

	*returned_len = offset;
	return new_buf;
}

/* builds a char* buffer from SIP message including body
 * The function adjusts the Content-Length HF according
 * to body lumps in case of touch_clen=1.
 */
char *build_all(struct sip_msg *msg, int touch_clen, unsigned int *returned_len,
		int *error, struct dest_info *send_info)
{
	char *buf, *new_buf;
	unsigned int offset, s_offset, len, new_len;
	unsigned int body_delta;

	*error = 0;
	/* Calculate message body difference */
	body_delta = lumps_len(msg, msg->body_lumps, send_info);
	if(touch_clen) {
		/* adjust Content-Length */
		if(adjust_clen(msg, body_delta, send_info->proto) < 0) {
			LM_ERR("Error while adjusting Content-Length\n");
			*error = -1;
			return 0;
		}
	}

	buf = msg->buf;
	/* original msg length */
	len = msg->len;
	/* new msg length */
	new_len = len +									   /* original length  */
			  lumps_len(msg, msg->add_rm, send_info) + /* hdr lumps */
			  body_delta;							   /* body lumps */

	if(new_len == 0) {
		returned_len = 0;
		return 0;
	}

	new_buf = (char *)pkg_malloc(new_len + 1);
	if(!new_buf) {
		PKG_MEM_ERROR;
		*error = -1;
		return 0;
	}
	new_buf[0] = 0;
	offset = s_offset = 0;

	/* copy message lumps */
	process_lumps(msg, msg->add_rm, new_buf, &offset, &s_offset, send_info,
			FLAG_MSG_ALL);
	/* copy body lumps */
	process_lumps(msg, msg->body_lumps, new_buf, &offset, &s_offset, send_info,
			FLAG_MSG_ALL);
	/* copy the rest of the message */
	memcpy(new_buf + offset, buf + s_offset, len - s_offset);
	offset += (len - s_offset);
	new_buf[offset] = 0;

	*returned_len = offset;
	return new_buf;
}


/**
 * parse buf in msg and fill several fields
 */
int build_sip_msg_from_buf(
		struct sip_msg *msg, char *buf, int len, unsigned int id)
{
	if(msg == 0 || buf == 0)
		return -1;

	memset(msg, 0, sizeof(sip_msg_t));
	msg->id = id;
	msg->pid = my_pid();
	msg->buf = buf;
	msg->len = len;
	if(parse_msg(buf, len, msg) != 0) {
		LM_ERR("parsing failed\n");
		return -1;
	}
	msg->set_global_address = default_global_address;
	msg->set_global_port = default_global_port;
	return 0;
}

/**
 *
 */
int sip_msg_update_buffer(sip_msg_t *msg, str *obuf)
{
	sip_msg_t tmp;

	if(obuf == NULL || obuf->s == NULL || obuf->len <= 0) {
		LM_ERR("invalid buffer parameter\n");
		return -1;
	}
#ifdef USE_TCP
	if(tcp_get_clone_rcvbuf() == 0) {
		LM_ERR("tcp clone received buffer not enabled\n");
		return -1;
	}
#endif
	if(obuf->len >= BUF_SIZE) {
		LM_ERR("new buffer is too large (%d)\n", obuf->len);
		return -1;
	}
	/* temporary copy */
	memcpy(&tmp, msg, sizeof(sip_msg_t));

	/* reset dst uri and path vector to avoid freeing - restored later */
	if(msg->dst_uri.s != NULL) {
		msg->dst_uri.s = NULL;
		msg->dst_uri.len = 0;
	}
	if(msg->path_vec.s != NULL) {
		msg->path_vec.s = NULL;
		msg->path_vec.len = 0;
	}

	/* free old msg structure */
	free_sip_msg(msg);
	memset(msg, 0, sizeof(sip_msg_t));

	/* restore msg fields */
	msg->buf = tmp.buf;
	msg->id = tmp.id;
	msg->pid = tmp.pid;
	msg->rcv = tmp.rcv;
	msg->set_global_address = tmp.set_global_address;
	msg->set_global_port = tmp.set_global_port;
	msg->flags = tmp.flags;
	msg->msg_flags = tmp.msg_flags;
	memcpy(msg->xflags, tmp.xflags, KSR_XFLAGS_SIZE * sizeof(flag_t));
	msg->hash_index = tmp.hash_index;
	msg->force_send_socket = tmp.force_send_socket;
	msg->fwd_send_flags = tmp.fwd_send_flags;
	msg->rpl_send_flags = tmp.rpl_send_flags;
	msg->dst_uri = tmp.dst_uri;
	msg->path_vec = tmp.path_vec;

	memcpy(msg->buf, obuf->s, obuf->len);
	msg->len = obuf->len;
	msg->buf[msg->len] = '\0';

	/* reparse the message */
	LM_DBG("SIP message content updated - reparsing\n");
	if(parse_msg(msg->buf, msg->len, msg) != 0) {
		LM_ERR("parsing new sip message failed [[%.*s]]\n", msg->len, msg->buf);
		/* exit config execution - sip_msg_t structure is no longer
		 * valid/safe for config */
		return 0;
	}
	if(parse_headers(msg, HDR_FROM_F | HDR_TO_F | HDR_CALLID_F | HDR_CSEQ_F, 0)
			< 0) {
		LM_ERR("parsing main headers of new sip message failed [[%.*s]]\n",
				msg->len, msg->buf);
		/* exit config execution - sip_msg_t structure is no longer
		 * valid/safe for config */
		return 0;
	}
	return 1;
}

/**
 * evaluate changes and set the output buffer
 * - obuf->s has to be pkg freed
 * - return: 1 on success, -1 on failure
 */
int sip_msg_eval_changes(sip_msg_t *msg, str *obuf)
{
	dest_info_t dst;

	init_dest_info(&dst);
	dst.proto = PROTO_UDP;
	if(msg->first_line.type == SIP_REPLY) {
		obuf->s = generate_res_buf_from_sip_res(
				msg, (unsigned int *)&obuf->len, BUILD_NO_VIA1_UPDATE);
	} else {
		obuf->s = build_req_buf_from_sip_req(msg, (unsigned int *)&obuf->len,
				&dst,
				BUILD_NO_PATH | BUILD_NO_LOCAL_VIA | BUILD_NO_VIA1_UPDATE);
	}
	if(obuf->s == NULL) {
		LM_ERR("couldn't update msg buffer content\n");
		return -1;
	}

	return 1;
}

/**
 *
 */
int sip_msg_apply_changes(sip_msg_t *msg)
{
	int ret;
	dest_info_t dst;
	str obuf;

	if(msg->first_line.type != SIP_REPLY && get_route_type() != REQUEST_ROUTE) {
		LM_ERR("invalid usage - not in request route or a reply\n");
		return -1;
	}

	init_dest_info(&dst);
	dst.proto = PROTO_UDP;
	if(msg->first_line.type == SIP_REPLY) {
		obuf.s = generate_res_buf_from_sip_res(
				msg, (unsigned int *)&obuf.len, BUILD_NO_VIA1_UPDATE);
	} else {
		if(msg->msg_flags & FL_RR_ADDED) {
			LM_ERR("cannot apply msg changes after adding record-route"
				   " header - it breaks conditional 2nd header\n");
			return -1;
		}
		obuf.s = build_req_buf_from_sip_req(msg, (unsigned int *)&obuf.len,
				&dst,
				BUILD_NO_PATH | BUILD_NO_LOCAL_VIA | BUILD_NO_VIA1_UPDATE);
	}
	if(obuf.s == NULL) {
		LM_ERR("couldn't update msg buffer content\n");
		return -1;
	}
	ret = sip_msg_update_buffer(msg, &obuf);
	/* free new buffer - copied in the static buffer from old sip_msg_t */
	pkg_free(obuf.s);

	return ret;
}
